243 lines
6.5 KiB
C
243 lines
6.5 KiB
C
/*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
|
|
*
|
|
* Authors:
|
|
* Anup Patel <anup.patel@wdc.com>
|
|
*/
|
|
|
|
#include <sbi/sbi_console.h>
|
|
#include <sbi/sbi_ecall.h>
|
|
#include <sbi/sbi_ecall_interface.h>
|
|
#include <sbi/sbi_error.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_hart.h>
|
|
#include <sbi/sbi_version.h>
|
|
#include <sbi/riscv_asm.h>
|
|
|
|
#define SBI_ECALL_VERSION_MAJOR 0
|
|
#define SBI_ECALL_VERSION_MINOR 2
|
|
#define SBI_OPENSBI_IMPID 1
|
|
|
|
u16 sbi_ecall_version_major(void)
|
|
{
|
|
return SBI_ECALL_VERSION_MAJOR;
|
|
}
|
|
|
|
u16 sbi_ecall_version_minor(void)
|
|
{
|
|
return SBI_ECALL_VERSION_MINOR;
|
|
}
|
|
|
|
int sbi_check_extension(struct sbi_scratch *scratch, unsigned long extid,
|
|
unsigned long *out_val)
|
|
{
|
|
/**
|
|
* Each extension apart from base & 0.1, will be implemented as
|
|
* platform specific feature. Thus, extension probing can be achieved
|
|
* by checking the feature bits of the platform. We can create a map
|
|
* between extension ID & feature and use a generic function to check
|
|
* or just use a switch case for every new extension support added
|
|
* TODO: Implement it.
|
|
*/
|
|
|
|
if ((extid >= SBI_EXT_0_1_SET_TIMER &&
|
|
extid <= SBI_EXT_0_1_SHUTDOWN) || (extid == SBI_EXT_BASE)) {
|
|
*out_val = 1;
|
|
} else if (extid >= SBI_EXT_VENDOR_START &&
|
|
extid <= SBI_EXT_VENDOR_END) {
|
|
*out_val = sbi_platform_vendor_ext_check(
|
|
sbi_platform_ptr(scratch),
|
|
extid);
|
|
} else
|
|
*out_val = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sbi_ecall_vendor_ext_handler(struct sbi_scratch *scratch,
|
|
unsigned long extid, unsigned long funcid,
|
|
unsigned long *args, unsigned long *out_val,
|
|
unsigned long *out_tcause,
|
|
unsigned long *out_tval)
|
|
{
|
|
return sbi_platform_vendor_ext_provider(sbi_platform_ptr(scratch),
|
|
extid, funcid, args, out_val,
|
|
out_tcause, out_tval);
|
|
}
|
|
|
|
int sbi_ecall_base_handler(struct sbi_scratch *scratch, unsigned long extid,
|
|
unsigned long funcid, unsigned long *args,
|
|
unsigned long *out_val, unsigned long *out_tcause,
|
|
unsigned long *out_tval)
|
|
{
|
|
int ret = 0;
|
|
|
|
switch (funcid) {
|
|
case SBI_EXT_BASE_GET_SPEC_VERSION:
|
|
*out_val = (SBI_ECALL_VERSION_MAJOR <<
|
|
SBI_SPEC_VERSION_MAJOR_OFFSET) &
|
|
(SBI_SPEC_VERSION_MAJOR_MASK <<
|
|
SBI_SPEC_VERSION_MAJOR_OFFSET);
|
|
*out_val = *out_val | SBI_ECALL_VERSION_MINOR;
|
|
break;
|
|
case SBI_EXT_BASE_GET_IMP_ID:
|
|
*out_val = SBI_OPENSBI_IMPID;
|
|
break;
|
|
case SBI_EXT_BASE_GET_IMP_VERSION:
|
|
*out_val = OPENSBI_VERSION;
|
|
break;
|
|
case SBI_EXT_BASE_GET_MVENDORID:
|
|
*out_val = csr_read(CSR_MVENDORID);
|
|
break;
|
|
case SBI_EXT_BASE_GET_MARCHID:
|
|
*out_val = csr_read(CSR_MARCHID);
|
|
break;
|
|
case SBI_EXT_BASE_GET_MIMPID:
|
|
*out_val = csr_read(CSR_MIMPID);
|
|
break;
|
|
case SBI_EXT_BASE_PROBE_EXT:
|
|
ret = sbi_check_extension(scratch, args[0], out_val);
|
|
default:
|
|
ret = SBI_ENOTSUPP;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int sbi_ecall_0_1_handler(struct sbi_scratch *scratch, unsigned long extid,
|
|
unsigned long *args, unsigned long *tval,
|
|
unsigned long *tcause)
|
|
{
|
|
int ret = 0;
|
|
struct sbi_tlb_info tlb_info;
|
|
u32 source_hart = sbi_current_hartid();
|
|
struct unpriv_trap uptrap = {0};
|
|
|
|
switch (extid) {
|
|
case SBI_EXT_0_1_SET_TIMER:
|
|
#if __riscv_xlen == 32
|
|
sbi_timer_event_start(scratch,
|
|
(((u64)args[1] << 32) | (u64)args[0]));
|
|
#else
|
|
sbi_timer_event_start(scratch, (u64)args[0]);
|
|
#endif
|
|
break;
|
|
case SBI_EXT_0_1_CONSOLE_PUTCHAR:
|
|
sbi_putc(args[0]);
|
|
break;
|
|
case SBI_EXT_0_1_CONSOLE_GETCHAR:
|
|
ret = sbi_getc();
|
|
break;
|
|
case SBI_EXT_0_1_CLEAR_IPI:
|
|
sbi_ipi_clear_smode(scratch);
|
|
break;
|
|
case SBI_EXT_0_1_SEND_IPI:
|
|
ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)args[0],
|
|
SBI_IPI_EVENT_SOFT, NULL);
|
|
break;
|
|
case SBI_EXT_0_1_REMOTE_FENCE_I:
|
|
tlb_info.start = 0;
|
|
tlb_info.size = 0;
|
|
tlb_info.type = SBI_ITLB_FLUSH;
|
|
tlb_info.shart_mask = 1UL << source_hart;
|
|
ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)args[0],
|
|
SBI_IPI_EVENT_FENCE_I, &tlb_info);
|
|
break;
|
|
case SBI_EXT_0_1_REMOTE_SFENCE_VMA:
|
|
tlb_info.start = (unsigned long)args[1];
|
|
tlb_info.size = (unsigned long)args[2];
|
|
tlb_info.type = SBI_TLB_FLUSH_VMA;
|
|
tlb_info.shart_mask = 1UL << source_hart;
|
|
|
|
ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)args[0],
|
|
SBI_IPI_EVENT_SFENCE_VMA, &tlb_info);
|
|
break;
|
|
case SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID:
|
|
tlb_info.start = (unsigned long)args[1];
|
|
tlb_info.size = (unsigned long)args[2];
|
|
tlb_info.asid = (unsigned long)args[3];
|
|
tlb_info.type = SBI_TLB_FLUSH_VMA_ASID;
|
|
tlb_info.shart_mask = 1UL << source_hart;
|
|
|
|
ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)args[0],
|
|
SBI_IPI_EVENT_SFENCE_VMA_ASID,
|
|
&tlb_info);
|
|
break;
|
|
case SBI_EXT_0_1_SHUTDOWN:
|
|
sbi_system_shutdown(scratch, 0);
|
|
break;
|
|
default:
|
|
ret = SBI_ENOTSUPP;
|
|
};
|
|
|
|
if (ret == SBI_ETRAP) {
|
|
*tcause = uptrap.cause;
|
|
*tval = uptrap.tval;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int sbi_ecall_handler(u32 hartid, ulong mcause, struct sbi_trap_regs *regs,
|
|
struct sbi_scratch *scratch)
|
|
{
|
|
int ret = 0;
|
|
unsigned long extension_id = regs->a7;
|
|
unsigned long func_id = regs->a6;
|
|
unsigned long out_val;
|
|
unsigned long out_tval;
|
|
unsigned long out_tcause;
|
|
bool is_0_1_spec = 0;
|
|
unsigned long args[6];
|
|
|
|
args[0] = regs->a0;
|
|
args[1] = regs->a1;
|
|
args[2] = regs->a2;
|
|
args[3] = regs->a3;
|
|
args[4] = regs->a4;
|
|
args[5] = regs->a5;
|
|
|
|
if (extension_id >= SBI_EXT_0_1_SET_TIMER &&
|
|
extension_id <= SBI_EXT_0_1_SHUTDOWN) {
|
|
ret = sbi_ecall_0_1_handler(scratch, extension_id, args,
|
|
&out_tval, &out_tcause);
|
|
is_0_1_spec = 1;
|
|
} else if (extension_id == SBI_EXT_BASE)
|
|
ret = sbi_ecall_base_handler(scratch, extension_id, func_id,
|
|
args, &out_val,
|
|
&out_tval, &out_tcause);
|
|
else if (extension_id >= SBI_EXT_VENDOR_START &&
|
|
extension_id <= SBI_EXT_VENDOR_END) {
|
|
ret = sbi_ecall_vendor_ext_handler(scratch, extension_id,
|
|
func_id, args, &out_val,
|
|
&out_tval, &out_tcause);
|
|
} else {
|
|
ret = SBI_ENOTSUPP;
|
|
}
|
|
|
|
if (ret == SBI_ETRAP) {
|
|
sbi_trap_redirect(regs, scratch, regs->mepc,
|
|
out_tcause, out_tval);
|
|
} else {
|
|
/* This function should return non-zero value only in case of
|
|
* fatal error. However, there is no good way to distinguish
|
|
* between a fatal and non-fatal errors yet. That's why we treat
|
|
* every return value except ETRAP as non-fatal and just return
|
|
* accordingly for now. Once fatal errors are defined, that
|
|
* case should be handled differently.
|
|
*/
|
|
regs->mepc += 4;
|
|
regs->a0 = ret;
|
|
if (!is_0_1_spec)
|
|
regs->a1 = out_val;
|
|
}
|
|
|
|
return 0;
|
|
}
|