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arch/riscv: add new SBI calls

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This is just a start. We are playing catch up.

7 down, 70+ to go.

Signed-off-by: Ronald G Minnich <rminnich@gmail.com>

Change-Id: I5dac8613020e26ec74ac1c74158fc9791553693f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81294
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
This commit is contained in:
Ronald G Minnich
2024-03-15 22:25:02 -07:00
committed by ron minnich
parent c47fa32cb1
commit 595efe4f20
1 changed files with 70 additions and 5 deletions
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75
src/arch/riscv/sbi.c
View File

@@ -1,5 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <mcall.h>
#include <stdint.h>
#include <arch/exception.h>
@@ -49,6 +50,54 @@ static uintptr_t sbi_clear_ipi(void)
return 0;
}
static void print_sbi_trap(uintptr_t trap)
{
switch (trap) {
case SBI_SHUTDOWN:
printk(BIOS_EMERG, "SBI_SHUTDOWN\n");
break;
case SBI_REMOTE_SFENCE_VMA_ASID:
printk(BIOS_EMERG, "SBI_REMOTE_SFENCE_VMA_ASID\n");
break;
case SBI_REMOTE_SFENCE_VMA:
printk(BIOS_EMERG, "SBI_REMOTE_SFENCE_VMA\n");
break;
case SBI_REMOTE_FENCE_I:
printk(BIOS_EMERG, "SBI_REMOTE_FENCE_I\n");
break;
case SBI_SEND_IPI:
printk(BIOS_EMERG, "SBI_SEND_IPI\n");
break;
case SBI_CLEAR_IPI:
printk(BIOS_EMERG, "SBI_CLEAR_IPI\n");
break;
case SBI_CONSOLE_GETCHAR:
printk(BIOS_EMERG, "SBI_CONSOLE_GETCHAR\n");
break;
case SBI_CONSOLE_PUTCHAR:
printk(BIOS_EMERG, "SBI_CONSOLE_PUTCHAR\n");
break;
case SBI_SET_TIMER:
printk(BIOS_EMERG, "SBI_SET_TIMER\n");
break;
case SBI_BASE_EXTENSION:
printk(BIOS_EMERG, "SBI_BASE_EXTENSION\n");
break;
default:
printk(BIOS_EMERG, "%lx is an unknown SBI trap\n", trap);
break;
}
}
/*
* These are the default SBI extension values.
* They can be overridden, by specialized code,
* but since this is a GPL SBI, it may be better
* that they evolve as we extend this SBI.
* over time, the will be updated.
*/
int sbi_features[] = {1, 0, 0, 0, 0, 0, 0};
/*
* sbi is triggered by the s-mode ecall
* parameter : register a0 a1 a2
@@ -58,11 +107,14 @@ static uintptr_t sbi_clear_ipi(void)
void handle_sbi(struct trapframe *tf)
{
uintptr_t ret = 0;
uintptr_t sbiret = 0;
uintptr_t arg0 = tf->gpr[10];
__maybe_unused uintptr_t arg1 = tf->gpr[11];
uintptr_t which = tf->gpr[17];
uintptr_t fid = tf->gpr[16];
uintptr_t eid = tf->gpr[17];
uintptr_t retpc = read_csr(mepc) + 4;
switch (which) {
switch (eid) {
case SBI_SET_TIMER:
#if __riscv_xlen == 32
ret = sbi_set_timer(arg0 + ((uint64_t)arg1 << 32));
@@ -96,10 +148,23 @@ void handle_sbi(struct trapframe *tf)
case SBI_SHUTDOWN:
ret = send_ipi((uintptr_t *)arg0, IPI_SHUTDOWN);
break;
case SBI_BASE_EXTENSION:
/* zero is an allowed return value for most features,
* and the only required one is feature 0.
* So this test will return legal values
* for all possible values of fid.
*/
if (fid < ARRAY_SIZE(sbi_features))
ret = sbi_features[fid];
break;
default:
ret = -SBI_ENOSYS;
print_sbi_trap(eid);
printk(BIOS_EMERG, "SBI: %lx: ENOSYS\n", fid);
sbiret = -SBI_ENOSYS;
break;
}
tf->gpr[10] = ret;
write_csr(mepc, read_csr(mepc) + 4);
tf->gpr[10] = sbiret;
tf->gpr[11] = ret;
write_csr(mepc, retpc);
}