mirror of
https://github.com/brain-hackers/u-boot-brain
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![Simon Glass](/assets/img/avatar_default.png)
Add a rough function to handle jumping from 32-bit SPL to 64-bit U-Boot. This still needs work to clean it up. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
599 lines
14 KiB
C
599 lines
14 KiB
C
/*
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* (C) Copyright 2008-2011
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* Graeme Russ, <graeme.russ@gmail.com>
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*
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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*
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* Part of this file is adapted from coreboot
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* src/arch/x86/lib/cpu.c
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <malloc.h>
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#include <asm/control_regs.h>
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#include <asm/cpu.h>
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#include <asm/mp.h>
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#include <asm/msr.h>
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#include <asm/mtrr.h>
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#include <asm/processor-flags.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Constructor for a conventional segment GDT (or LDT) entry
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* This is a macro so it can be used in initialisers
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*/
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#define GDT_ENTRY(flags, base, limit) \
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((((base) & 0xff000000ULL) << (56-24)) | \
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(((flags) & 0x0000f0ffULL) << 40) | \
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(((limit) & 0x000f0000ULL) << (48-16)) | \
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(((base) & 0x00ffffffULL) << 16) | \
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(((limit) & 0x0000ffffULL)))
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struct gdt_ptr {
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u16 len;
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u32 ptr;
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} __packed;
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struct cpu_device_id {
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unsigned vendor;
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unsigned device;
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};
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struct cpuinfo_x86 {
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uint8_t x86; /* CPU family */
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uint8_t x86_vendor; /* CPU vendor */
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uint8_t x86_model;
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uint8_t x86_mask;
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};
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/*
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* List of cpu vendor strings along with their normalized
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* id values.
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*/
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static const struct {
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int vendor;
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const char *name;
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} x86_vendors[] = {
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{ X86_VENDOR_INTEL, "GenuineIntel", },
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{ X86_VENDOR_CYRIX, "CyrixInstead", },
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{ X86_VENDOR_AMD, "AuthenticAMD", },
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{ X86_VENDOR_UMC, "UMC UMC UMC ", },
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{ X86_VENDOR_NEXGEN, "NexGenDriven", },
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{ X86_VENDOR_CENTAUR, "CentaurHauls", },
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{ X86_VENDOR_RISE, "RiseRiseRise", },
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{ X86_VENDOR_TRANSMETA, "GenuineTMx86", },
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{ X86_VENDOR_TRANSMETA, "TransmetaCPU", },
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{ X86_VENDOR_NSC, "Geode by NSC", },
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{ X86_VENDOR_SIS, "SiS SiS SiS ", },
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};
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static void load_ds(u32 segment)
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{
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asm volatile("movl %0, %%ds" : : "r" (segment * X86_GDT_ENTRY_SIZE));
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}
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static void load_es(u32 segment)
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{
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asm volatile("movl %0, %%es" : : "r" (segment * X86_GDT_ENTRY_SIZE));
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}
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static void load_fs(u32 segment)
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{
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asm volatile("movl %0, %%fs" : : "r" (segment * X86_GDT_ENTRY_SIZE));
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}
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static void load_gs(u32 segment)
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{
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asm volatile("movl %0, %%gs" : : "r" (segment * X86_GDT_ENTRY_SIZE));
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}
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static void load_ss(u32 segment)
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{
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asm volatile("movl %0, %%ss" : : "r" (segment * X86_GDT_ENTRY_SIZE));
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}
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static void load_gdt(const u64 *boot_gdt, u16 num_entries)
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{
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struct gdt_ptr gdt;
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gdt.len = (num_entries * X86_GDT_ENTRY_SIZE) - 1;
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gdt.ptr = (ulong)boot_gdt;
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asm volatile("lgdtl %0\n" : : "m" (gdt));
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}
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void arch_setup_gd(gd_t *new_gd)
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{
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u64 *gdt_addr;
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gdt_addr = new_gd->arch.gdt;
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/*
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* CS: code, read/execute, 4 GB, base 0
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*
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* Some OS (like VxWorks) requires GDT entry 1 to be the 32-bit CS
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*/
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gdt_addr[X86_GDT_ENTRY_UNUSED] = GDT_ENTRY(0xc09b, 0, 0xfffff);
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gdt_addr[X86_GDT_ENTRY_32BIT_CS] = GDT_ENTRY(0xc09b, 0, 0xfffff);
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/* DS: data, read/write, 4 GB, base 0 */
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gdt_addr[X86_GDT_ENTRY_32BIT_DS] = GDT_ENTRY(0xc093, 0, 0xfffff);
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/* FS: data, read/write, 4 GB, base (Global Data Pointer) */
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new_gd->arch.gd_addr = new_gd;
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gdt_addr[X86_GDT_ENTRY_32BIT_FS] = GDT_ENTRY(0xc093,
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(ulong)&new_gd->arch.gd_addr, 0xfffff);
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/* 16-bit CS: code, read/execute, 64 kB, base 0 */
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gdt_addr[X86_GDT_ENTRY_16BIT_CS] = GDT_ENTRY(0x009b, 0, 0x0ffff);
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/* 16-bit DS: data, read/write, 64 kB, base 0 */
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gdt_addr[X86_GDT_ENTRY_16BIT_DS] = GDT_ENTRY(0x0093, 0, 0x0ffff);
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gdt_addr[X86_GDT_ENTRY_16BIT_FLAT_CS] = GDT_ENTRY(0x809b, 0, 0xfffff);
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gdt_addr[X86_GDT_ENTRY_16BIT_FLAT_DS] = GDT_ENTRY(0x8093, 0, 0xfffff);
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load_gdt(gdt_addr, X86_GDT_NUM_ENTRIES);
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load_ds(X86_GDT_ENTRY_32BIT_DS);
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load_es(X86_GDT_ENTRY_32BIT_DS);
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load_gs(X86_GDT_ENTRY_32BIT_DS);
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load_ss(X86_GDT_ENTRY_32BIT_DS);
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load_fs(X86_GDT_ENTRY_32BIT_FS);
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}
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#ifdef CONFIG_HAVE_FSP
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/*
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* Setup FSP execution environment GDT
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*
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* Per Intel FSP external architecture specification, before calling any FSP
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* APIs, we need make sure the system is in flat 32-bit mode and both the code
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* and data selectors should have full 4GB access range. Here we reuse the one
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* we used in arch/x86/cpu/start16.S, and reload the segement registers.
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*/
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void setup_fsp_gdt(void)
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{
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load_gdt((const u64 *)(gdt_rom + CONFIG_RESET_SEG_START), 4);
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load_ds(X86_GDT_ENTRY_32BIT_DS);
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load_ss(X86_GDT_ENTRY_32BIT_DS);
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load_es(X86_GDT_ENTRY_32BIT_DS);
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load_fs(X86_GDT_ENTRY_32BIT_DS);
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load_gs(X86_GDT_ENTRY_32BIT_DS);
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}
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#endif
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/*
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* Cyrix CPUs without cpuid or with cpuid not yet enabled can be detected
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* by the fact that they preserve the flags across the division of 5/2.
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* PII and PPro exhibit this behavior too, but they have cpuid available.
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*/
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/*
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* Perform the Cyrix 5/2 test. A Cyrix won't change
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* the flags, while other 486 chips will.
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*/
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static inline int test_cyrix_52div(void)
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{
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unsigned int test;
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__asm__ __volatile__(
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"sahf\n\t" /* clear flags (%eax = 0x0005) */
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"div %b2\n\t" /* divide 5 by 2 */
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"lahf" /* store flags into %ah */
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: "=a" (test)
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: "0" (5), "q" (2)
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: "cc");
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/* AH is 0x02 on Cyrix after the divide.. */
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return (unsigned char) (test >> 8) == 0x02;
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}
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/*
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* Detect a NexGen CPU running without BIOS hypercode new enough
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* to have CPUID. (Thanks to Herbert Oppmann)
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*/
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static int deep_magic_nexgen_probe(void)
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{
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int ret;
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__asm__ __volatile__ (
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" movw $0x5555, %%ax\n"
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" xorw %%dx,%%dx\n"
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" movw $2, %%cx\n"
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" divw %%cx\n"
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" movl $0, %%eax\n"
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" jnz 1f\n"
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" movl $1, %%eax\n"
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"1:\n"
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: "=a" (ret) : : "cx", "dx");
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return ret;
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}
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static bool has_cpuid(void)
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{
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return flag_is_changeable_p(X86_EFLAGS_ID);
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}
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static bool has_mtrr(void)
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{
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return cpuid_edx(0x00000001) & (1 << 12) ? true : false;
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}
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static int build_vendor_name(char *vendor_name)
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{
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struct cpuid_result result;
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result = cpuid(0x00000000);
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unsigned int *name_as_ints = (unsigned int *)vendor_name;
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name_as_ints[0] = result.ebx;
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name_as_ints[1] = result.edx;
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name_as_ints[2] = result.ecx;
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return result.eax;
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}
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static void identify_cpu(struct cpu_device_id *cpu)
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{
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char vendor_name[16];
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int i;
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vendor_name[0] = '\0'; /* Unset */
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cpu->device = 0; /* fix gcc 4.4.4 warning */
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/* Find the id and vendor_name */
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if (!has_cpuid()) {
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/* Its a 486 if we can modify the AC flag */
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if (flag_is_changeable_p(X86_EFLAGS_AC))
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cpu->device = 0x00000400; /* 486 */
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else
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cpu->device = 0x00000300; /* 386 */
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if ((cpu->device == 0x00000400) && test_cyrix_52div()) {
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memcpy(vendor_name, "CyrixInstead", 13);
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/* If we ever care we can enable cpuid here */
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}
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/* Detect NexGen with old hypercode */
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else if (deep_magic_nexgen_probe())
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memcpy(vendor_name, "NexGenDriven", 13);
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}
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if (has_cpuid()) {
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int cpuid_level;
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cpuid_level = build_vendor_name(vendor_name);
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vendor_name[12] = '\0';
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/* Intel-defined flags: level 0x00000001 */
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if (cpuid_level >= 0x00000001) {
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cpu->device = cpuid_eax(0x00000001);
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} else {
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/* Have CPUID level 0 only unheard of */
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cpu->device = 0x00000400;
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}
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}
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cpu->vendor = X86_VENDOR_UNKNOWN;
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for (i = 0; i < ARRAY_SIZE(x86_vendors); i++) {
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if (memcmp(vendor_name, x86_vendors[i].name, 12) == 0) {
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cpu->vendor = x86_vendors[i].vendor;
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break;
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}
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}
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}
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static inline void get_fms(struct cpuinfo_x86 *c, uint32_t tfms)
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{
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c->x86 = (tfms >> 8) & 0xf;
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c->x86_model = (tfms >> 4) & 0xf;
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c->x86_mask = tfms & 0xf;
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if (c->x86 == 0xf)
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c->x86 += (tfms >> 20) & 0xff;
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if (c->x86 >= 0x6)
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c->x86_model += ((tfms >> 16) & 0xF) << 4;
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}
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u32 cpu_get_family_model(void)
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{
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return gd->arch.x86_device & 0x0fff0ff0;
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}
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u32 cpu_get_stepping(void)
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{
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return gd->arch.x86_mask;
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}
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int x86_cpu_init_f(void)
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{
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const u32 em_rst = ~X86_CR0_EM;
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const u32 mp_ne_set = X86_CR0_MP | X86_CR0_NE;
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if (ll_boot_init()) {
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/* initialize FPU, reset EM, set MP and NE */
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asm ("fninit\n" \
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"movl %%cr0, %%eax\n" \
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"andl %0, %%eax\n" \
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"orl %1, %%eax\n" \
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"movl %%eax, %%cr0\n" \
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: : "i" (em_rst), "i" (mp_ne_set) : "eax");
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}
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/* identify CPU via cpuid and store the decoded info into gd->arch */
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if (has_cpuid()) {
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struct cpu_device_id cpu;
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struct cpuinfo_x86 c;
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identify_cpu(&cpu);
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get_fms(&c, cpu.device);
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gd->arch.x86 = c.x86;
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gd->arch.x86_vendor = cpu.vendor;
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gd->arch.x86_model = c.x86_model;
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gd->arch.x86_mask = c.x86_mask;
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gd->arch.x86_device = cpu.device;
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gd->arch.has_mtrr = has_mtrr();
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}
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/* Don't allow PCI region 3 to use memory in the 2-4GB memory hole */
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gd->pci_ram_top = 0x80000000U;
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/* Configure fixed range MTRRs for some legacy regions */
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if (gd->arch.has_mtrr) {
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u64 mtrr_cap;
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mtrr_cap = native_read_msr(MTRR_CAP_MSR);
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if (mtrr_cap & MTRR_CAP_FIX) {
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/* Mark the VGA RAM area as uncacheable */
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native_write_msr(MTRR_FIX_16K_A0000_MSR,
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MTRR_FIX_TYPE(MTRR_TYPE_UNCACHEABLE),
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MTRR_FIX_TYPE(MTRR_TYPE_UNCACHEABLE));
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/*
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* Mark the PCI ROM area as cacheable to improve ROM
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* execution performance.
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*/
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native_write_msr(MTRR_FIX_4K_C0000_MSR,
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MTRR_FIX_TYPE(MTRR_TYPE_WRBACK),
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MTRR_FIX_TYPE(MTRR_TYPE_WRBACK));
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native_write_msr(MTRR_FIX_4K_C8000_MSR,
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MTRR_FIX_TYPE(MTRR_TYPE_WRBACK),
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MTRR_FIX_TYPE(MTRR_TYPE_WRBACK));
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native_write_msr(MTRR_FIX_4K_D0000_MSR,
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MTRR_FIX_TYPE(MTRR_TYPE_WRBACK),
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MTRR_FIX_TYPE(MTRR_TYPE_WRBACK));
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native_write_msr(MTRR_FIX_4K_D8000_MSR,
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MTRR_FIX_TYPE(MTRR_TYPE_WRBACK),
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MTRR_FIX_TYPE(MTRR_TYPE_WRBACK));
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/* Enable the fixed range MTRRs */
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msr_setbits_64(MTRR_DEF_TYPE_MSR, MTRR_DEF_TYPE_FIX_EN);
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}
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}
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#ifdef CONFIG_I8254_TIMER
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/* Set up the i8254 timer if required */
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i8254_init();
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#endif
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return 0;
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}
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void x86_enable_caches(void)
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{
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unsigned long cr0;
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cr0 = read_cr0();
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cr0 &= ~(X86_CR0_NW | X86_CR0_CD);
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write_cr0(cr0);
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wbinvd();
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}
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void enable_caches(void) __attribute__((weak, alias("x86_enable_caches")));
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void x86_disable_caches(void)
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{
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unsigned long cr0;
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cr0 = read_cr0();
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cr0 |= X86_CR0_NW | X86_CR0_CD;
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wbinvd();
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write_cr0(cr0);
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wbinvd();
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}
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void disable_caches(void) __attribute__((weak, alias("x86_disable_caches")));
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int dcache_status(void)
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{
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return !(read_cr0() & X86_CR0_CD);
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}
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void cpu_enable_paging_pae(ulong cr3)
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{
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__asm__ __volatile__(
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/* Load the page table address */
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"movl %0, %%cr3\n"
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/* Enable pae */
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"movl %%cr4, %%eax\n"
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"orl $0x00000020, %%eax\n"
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"movl %%eax, %%cr4\n"
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/* Enable paging */
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"movl %%cr0, %%eax\n"
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"orl $0x80000000, %%eax\n"
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"movl %%eax, %%cr0\n"
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:
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: "r" (cr3)
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: "eax");
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}
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void cpu_disable_paging_pae(void)
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{
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/* Turn off paging */
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__asm__ __volatile__ (
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/* Disable paging */
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"movl %%cr0, %%eax\n"
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"andl $0x7fffffff, %%eax\n"
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"movl %%eax, %%cr0\n"
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/* Disable pae */
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"movl %%cr4, %%eax\n"
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"andl $0xffffffdf, %%eax\n"
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"movl %%eax, %%cr4\n"
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:
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:
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: "eax");
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}
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static bool can_detect_long_mode(void)
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{
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return cpuid_eax(0x80000000) > 0x80000000UL;
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}
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static bool has_long_mode(void)
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{
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return cpuid_edx(0x80000001) & (1 << 29) ? true : false;
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}
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int cpu_has_64bit(void)
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{
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return has_cpuid() && can_detect_long_mode() &&
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has_long_mode();
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}
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#define PAGETABLE_SIZE (6 * 4096)
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/**
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* build_pagetable() - build a flat 4GiB page table structure for 64-bti mode
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*
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* @pgtable: Pointer to a 24iKB block of memory
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*/
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static void build_pagetable(uint32_t *pgtable)
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{
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uint i;
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memset(pgtable, '\0', PAGETABLE_SIZE);
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/* Level 4 needs a single entry */
|
|
pgtable[0] = (ulong)&pgtable[1024] + 7;
|
|
|
|
/* Level 3 has one 64-bit entry for each GiB of memory */
|
|
for (i = 0; i < 4; i++)
|
|
pgtable[1024 + i * 2] = (ulong)&pgtable[2048] + 0x1000 * i + 7;
|
|
|
|
/* Level 2 has 2048 64-bit entries, each repesenting 2MiB */
|
|
for (i = 0; i < 2048; i++)
|
|
pgtable[2048 + i * 2] = 0x183 + (i << 21UL);
|
|
}
|
|
|
|
int cpu_jump_to_64bit(ulong setup_base, ulong target)
|
|
{
|
|
uint32_t *pgtable;
|
|
|
|
pgtable = memalign(4096, PAGETABLE_SIZE);
|
|
if (!pgtable)
|
|
return -ENOMEM;
|
|
|
|
build_pagetable(pgtable);
|
|
cpu_call64((ulong)pgtable, setup_base, target);
|
|
free(pgtable);
|
|
|
|
return -EFAULT;
|
|
}
|
|
|
|
/*
|
|
* Jump from SPL to U-Boot
|
|
*
|
|
* This function is work-in-progress with many issues to resolve.
|
|
*
|
|
* It works by setting up several regions:
|
|
* ptr - a place to put the code that jumps into 64-bit mode
|
|
* gdt - a place to put the global descriptor table
|
|
* pgtable - a place to put the page tables
|
|
*
|
|
* The cpu_call64() code is copied from ROM and then manually patched so that
|
|
* it has the correct GDT address in RAM. U-Boot is copied from ROM into
|
|
* its pre-relocation address. Then we jump to the cpu_call64() code in RAM,
|
|
* which changes to 64-bit mode and starts U-Boot.
|
|
*/
|
|
int cpu_jump_to_64bit_uboot(ulong target)
|
|
{
|
|
typedef void (*func_t)(ulong pgtable, ulong setup_base, ulong target);
|
|
uint32_t *pgtable;
|
|
func_t func;
|
|
|
|
/* TODO(sjg@chromium.org): Find a better place for this */
|
|
pgtable = (uint32_t *)0x1000000;
|
|
if (!pgtable)
|
|
return -ENOMEM;
|
|
|
|
build_pagetable(pgtable);
|
|
|
|
/* TODO(sjg@chromium.org): Find a better place for this */
|
|
char *ptr = (char *)0x3000000;
|
|
char *gdt = (char *)0x3100000;
|
|
|
|
extern char gdt64[];
|
|
|
|
memcpy(ptr, cpu_call64, 0x1000);
|
|
memcpy(gdt, gdt64, 0x100);
|
|
|
|
/*
|
|
* TODO(sjg@chromium.org): This manually inserts the pointers into
|
|
* the code. Tidy this up to avoid this.
|
|
*/
|
|
func = (func_t)ptr;
|
|
ulong ofs = (ulong)cpu_call64 - (ulong)ptr;
|
|
*(ulong *)(ptr + 7) = (ulong)gdt;
|
|
*(ulong *)(ptr + 0xc) = (ulong)gdt + 2;
|
|
*(ulong *)(ptr + 0x13) = (ulong)gdt;
|
|
*(ulong *)(ptr + 0x117 - 0xd4) -= ofs;
|
|
|
|
/*
|
|
* Copy U-Boot from ROM
|
|
* TODO(sjg@chromium.org): Figure out a way to get the text base
|
|
* correctly here, and in the device-tree binman definition.
|
|
*
|
|
* Also consider using FIT so we get the correct image length and
|
|
* parameters.
|
|
*/
|
|
memcpy((char *)target, (char *)0xfff00000, 0x100000);
|
|
|
|
/* Jump to U-Boot */
|
|
func((ulong)pgtable, 0, (ulong)target);
|
|
|
|
return -EFAULT;
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static int enable_smis(struct udevice *cpu, void *unused)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct mp_flight_record mp_steps[] = {
|
|
MP_FR_BLOCK_APS(mp_init_cpu, NULL, mp_init_cpu, NULL),
|
|
/* Wait for APs to finish initialization before proceeding */
|
|
MP_FR_BLOCK_APS(NULL, NULL, enable_smis, NULL),
|
|
};
|
|
|
|
int x86_mp_init(void)
|
|
{
|
|
struct mp_params mp_params;
|
|
|
|
mp_params.parallel_microcode_load = 0,
|
|
mp_params.flight_plan = &mp_steps[0];
|
|
mp_params.num_records = ARRAY_SIZE(mp_steps);
|
|
mp_params.microcode_pointer = 0;
|
|
|
|
if (mp_init(&mp_params)) {
|
|
printf("Warning: MP init failure\n");
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|