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