Files
opensbi/lib/sbi/sbi_ecall_legacy.c
Anup Patel 80bc5065bb lib: sbi: Replace args with trap registers in ecall handler
We had added args pointer in ecall handler to ensure that ecall
handler only implements functionality and does not deal with
SBI calling convention. This also helped us to keep SBI calling
convention related code in one place at sbi_ecall_handler().

The Keystone Enclavce project needs access to the trap regsiters
in their ecall handler so that they can context switch enclaves
in custom SBI calls. To help the Keystone Enclave project, we
replace the args pointer in ecall handler parameter with a const
pointer to trap registers.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2021-01-07 09:53:14 +05:30

122 lines
3.0 KiB
C

/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
* Atish Patra <atish.patra@wdc.com>
*/
#include <sbi/riscv_asm.h>
#include <sbi/sbi_console.h>
#include <sbi/sbi_domain.h>
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_hsm.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_platform.h>
#include <sbi/sbi_system.h>
#include <sbi/sbi_timer.h>
#include <sbi/sbi_tlb.h>
#include <sbi/sbi_trap.h>
#include <sbi/sbi_unpriv.h>
#include <sbi/sbi_hart.h>
static int sbi_load_hart_mask_unpriv(ulong *pmask, ulong *hmask,
struct sbi_trap_info *uptrap)
{
ulong mask = 0;
if (pmask) {
mask = sbi_load_ulong(pmask, uptrap);
if (uptrap->cause)
return SBI_ETRAP;
} else {
sbi_hsm_hart_started_mask(sbi_domain_thishart_ptr(),
0, &mask);
}
*hmask = mask;
return 0;
}
static int sbi_ecall_legacy_handler(unsigned long extid, unsigned long funcid,
const struct sbi_trap_regs *regs,
unsigned long *out_val,
struct sbi_trap_info *out_trap)
{
int ret = 0;
struct sbi_tlb_info tlb_info;
u32 source_hart = current_hartid();
ulong hmask = 0;
switch (extid) {
case SBI_EXT_0_1_SET_TIMER:
#if __riscv_xlen == 32
sbi_timer_event_start((((u64)regs->a1 << 32) | (u64)regs->a0));
#else
sbi_timer_event_start((u64)regs->a0);
#endif
break;
case SBI_EXT_0_1_CONSOLE_PUTCHAR:
sbi_putc(regs->a0);
break;
case SBI_EXT_0_1_CONSOLE_GETCHAR:
ret = sbi_getc();
break;
case SBI_EXT_0_1_CLEAR_IPI:
sbi_ipi_clear_smode();
break;
case SBI_EXT_0_1_SEND_IPI:
ret = sbi_load_hart_mask_unpriv((ulong *)regs->a0,
&hmask, out_trap);
if (ret != SBI_ETRAP)
ret = sbi_ipi_send_smode(hmask, 0);
break;
case SBI_EXT_0_1_REMOTE_FENCE_I:
ret = sbi_load_hart_mask_unpriv((ulong *)regs->a0,
&hmask, out_trap);
if (ret != SBI_ETRAP) {
SBI_TLB_INFO_INIT(&tlb_info, 0, 0, 0, 0,
SBI_ITLB_FLUSH, source_hart);
ret = sbi_tlb_request(hmask, 0, &tlb_info);
}
break;
case SBI_EXT_0_1_REMOTE_SFENCE_VMA:
ret = sbi_load_hart_mask_unpriv((ulong *)regs->a0,
&hmask, out_trap);
if (ret != SBI_ETRAP) {
SBI_TLB_INFO_INIT(&tlb_info, regs->a1, regs->a2, 0, 0,
SBI_TLB_FLUSH_VMA, source_hart);
ret = sbi_tlb_request(hmask, 0, &tlb_info);
}
break;
case SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID:
ret = sbi_load_hart_mask_unpriv((ulong *)regs->a0,
&hmask, out_trap);
if (ret != SBI_ETRAP) {
SBI_TLB_INFO_INIT(&tlb_info, regs->a1,
regs->a2, regs->a3, 0,
SBI_TLB_FLUSH_VMA_ASID, source_hart);
ret = sbi_tlb_request(hmask, 0, &tlb_info);
}
break;
case SBI_EXT_0_1_SHUTDOWN:
sbi_system_reset(SBI_SRST_RESET_TYPE_SHUTDOWN,
SBI_SRST_RESET_REASON_NONE);
break;
default:
ret = SBI_ENOTSUPP;
};
return ret;
}
struct sbi_ecall_extension ecall_legacy = {
.extid_start = SBI_EXT_0_1_SET_TIMER,
.extid_end = SBI_EXT_0_1_SHUTDOWN,
.handle = sbi_ecall_legacy_handler,
};