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![Bin Meng](/assets/img/avatar_default.png)
Few v0.1 SBI calls are being replaced by new SBI calls that follows v0.2 calling convention. Implement the replacement extensions and few additional new SBI function calls that makes way for a better SBI interface in future. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Pragnesh Patel <pragnesh.patel@sifive.com>
188 lines
4.7 KiB
C
188 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* SBI initialilization and all extension implementation.
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*
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* Copyright (c) 2020 Western Digital Corporation or its affiliates.
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*
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* Taken from Linux arch/riscv/kernel/sbi.c
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*/
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#include <common.h>
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#include <asm/encoding.h>
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#include <asm/sbi.h>
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/* default SBI version is 0.1 */
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unsigned long sbi_spec_version = SBI_SPEC_VERSION_DEFAULT;
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struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
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unsigned long arg1, unsigned long arg2,
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unsigned long arg3, unsigned long arg4,
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unsigned long arg5)
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{
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struct sbiret ret;
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register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);
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register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);
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register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);
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register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3);
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register uintptr_t a4 asm ("a4") = (uintptr_t)(arg4);
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register uintptr_t a5 asm ("a5") = (uintptr_t)(arg5);
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register uintptr_t a6 asm ("a6") = (uintptr_t)(fid);
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register uintptr_t a7 asm ("a7") = (uintptr_t)(ext);
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asm volatile ("ecall"
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: "+r" (a0), "+r" (a1)
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: "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7)
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: "memory");
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ret.error = a0;
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ret.value = a1;
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return ret;
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}
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#ifdef CONFIG_SBI_V01
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/**
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* sbi_console_putchar() - Writes given character to the console device.
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* @ch: The data to be written to the console.
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*
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* Return: None
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*/
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void sbi_console_putchar(int ch)
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{
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sbi_ecall(SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, ch, 0, 0, 0, 0, 0);
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}
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/**
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* sbi_console_getchar() - Reads a byte from console device.
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*
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* Returns the value read from console.
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*/
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int sbi_console_getchar(void)
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{
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struct sbiret ret;
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ret = sbi_ecall(SBI_EXT_0_1_CONSOLE_GETCHAR, 0, 0, 0, 0, 0, 0, 0);
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return ret.error;
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}
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/**
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* sbi_clear_ipi() - Clear any pending IPIs for the calling hart.
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*
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* Return: None
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*/
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void sbi_clear_ipi(void)
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{
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sbi_ecall(SBI_EXT_0_1_CLEAR_IPI, 0, 0, 0, 0, 0, 0, 0);
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}
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/**
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* sbi_shutdown() - Remove all the harts from executing supervisor code.
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*
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* Return: None
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*/
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void sbi_shutdown(void)
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{
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sbi_ecall(SBI_EXT_0_1_SHUTDOWN, 0, 0, 0, 0, 0, 0, 0);
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}
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#endif /* CONFIG_SBI_V01 */
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/**
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* sbi_set_timer() - Program the timer for next timer event.
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* @stime_value: The value after which next timer event should fire.
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*
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* Return: None
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*/
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void sbi_set_timer(uint64_t stime_value)
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{
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#if __riscv_xlen == 32
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sbi_ecall(SBI_EXT_SET_TIMER, SBI_FID_SET_TIMER, stime_value,
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stime_value >> 32, 0, 0, 0, 0);
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#else
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sbi_ecall(SBI_EXT_SET_TIMER, SBI_FID_SET_TIMER, stime_value,
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0, 0, 0, 0, 0);
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#endif
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}
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/**
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* sbi_send_ipi() - Send an IPI to any hart.
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* @hart_mask: A cpu mask containing all the target harts.
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*
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* Return: None
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*/
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void sbi_send_ipi(const unsigned long *hart_mask)
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{
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sbi_ecall(SBI_EXT_SEND_IPI, SBI_FID_SEND_IPI, (unsigned long)hart_mask,
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0, 0, 0, 0, 0);
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}
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/**
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* sbi_remote_fence_i() - Execute FENCE.I instruction on given remote harts.
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* @hart_mask: A cpu mask containing all the target harts.
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*
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* Return: None
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*/
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void sbi_remote_fence_i(const unsigned long *hart_mask)
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{
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sbi_ecall(SBI_EXT_REMOTE_FENCE_I, SBI_FID_REMOTE_FENCE_I,
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(unsigned long)hart_mask, 0, 0, 0, 0, 0);
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}
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/**
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* sbi_remote_sfence_vma() - Execute SFENCE.VMA instructions on given remote
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* harts for the specified virtual address range.
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* @hart_mask: A cpu mask containing all the target harts.
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* @start: Start of the virtual address
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* @size: Total size of the virtual address range.
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*
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* Return: None
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*/
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void sbi_remote_sfence_vma(const unsigned long *hart_mask,
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unsigned long start,
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unsigned long size)
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{
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sbi_ecall(SBI_EXT_REMOTE_SFENCE_VMA, SBI_FID_REMOTE_SFENCE_VMA,
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(unsigned long)hart_mask, start, size, 0, 0, 0);
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}
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/**
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* sbi_remote_sfence_vma_asid() - Execute SFENCE.VMA instructions on given
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* remote harts for a virtual address range belonging to a specific ASID.
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*
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* @hart_mask: A cpu mask containing all the target harts.
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* @start: Start of the virtual address
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* @size: Total size of the virtual address range.
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* @asid: The value of address space identifier (ASID).
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*
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* Return: None
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*/
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void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
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unsigned long start,
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unsigned long size,
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unsigned long asid)
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{
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sbi_ecall(SBI_EXT_REMOTE_SFENCE_VMA_ASID,
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SBI_FID_REMOTE_SFENCE_VMA_ASID,
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(unsigned long)hart_mask, start, size, asid, 0, 0);
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}
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/**
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* sbi_probe_extension() - Check if an SBI extension ID is supported or not.
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* @extid: The extension ID to be probed.
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*
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* Return: Extension specific nonzero value f yes, -ENOTSUPP otherwise.
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*/
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int sbi_probe_extension(int extid)
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{
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struct sbiret ret;
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ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, extid,
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0, 0, 0, 0, 0);
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if (!ret.error)
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if (ret.value)
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return ret.value;
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return -ENOTSUPP;
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}
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