mirror of
https://github.com/brain-hackers/u-boot-brain
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ff6a8f3c06
The existing code is pretty ancient and is unreliable on modern hardware. Generally it will hang. We can use port 0xcf9 to initiate reset on more modern hardware (say in the last 10 years). Update the reset_cpu() function to do this, and add a new 'full reset' function to perform a full power cycle. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
/*
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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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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __ASM_PROCESSOR_H_
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#define __ASM_PROCESSOR_H_ 1
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#define X86_GDT_ENTRY_SIZE 8
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#define X86_GDT_ENTRY_NULL 0
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#define X86_GDT_ENTRY_UNUSED 1
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#define X86_GDT_ENTRY_32BIT_CS 2
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#define X86_GDT_ENTRY_32BIT_DS 3
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#define X86_GDT_ENTRY_32BIT_FS 4
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#define X86_GDT_ENTRY_16BIT_CS 5
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#define X86_GDT_ENTRY_16BIT_DS 6
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#define X86_GDT_ENTRY_16BIT_FLAT_CS 7
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#define X86_GDT_ENTRY_16BIT_FLAT_DS 8
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#define X86_GDT_NUM_ENTRIES 9
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#define X86_GDT_SIZE (X86_GDT_NUM_ENTRIES * X86_GDT_ENTRY_SIZE)
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#ifndef __ASSEMBLY__
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/*
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* This register is documented in (for example) the Intel Atom Processor E3800
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* Product Family Datasheet in "PCU - Power Management Controller (PMC)".
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*
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* RST_CNT: Reset Control Register (RST_CNT) Offset cf9.
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*
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* The naming follows Intel's naming.
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*/
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#define PORT_RESET 0xcf9
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enum {
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SYS_RST = 1 << 1, /* 0 for soft reset, 1 for hard reset */
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RST_CPU = 1 << 2, /* initiate reset */
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FULL_RST = 1 << 3, /* full power cycle */
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};
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/**
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* x86_full_reset() - reset everything: perform a full power cycle
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*/
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void x86_full_reset(void);
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static inline __attribute__((always_inline)) void cpu_hlt(void)
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{
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asm("hlt");
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}
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static inline ulong cpu_get_sp(void)
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{
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ulong result;
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asm volatile(
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"mov %%esp, %%eax"
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: "=a" (result));
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return result;
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}
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#endif /* __ASSEMBLY__ */
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#endif
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