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/*
* 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_unpriv.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;
}
static int sbi_load_hart_mask_unpriv(struct sbi_scratch *scratch, ulong *pmask,
ulong *hmask, struct sbi_trap_info *uptrap)
{
ulong mask = 0;
if (pmask) {
mask = sbi_load_ulong(pmask, scratch, uptrap);
if (uptrap->cause)
return SBI_ETRAP;
} else {
mask = sbi_hart_available_mask();
}
*hmask = mask;
return 0;
}
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) ||
(extid == SBI_EXT_TIME) ||
(extid == SBI_EXT_IPI)) {
*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,
struct sbi_trap_info *out_trap)
{
return sbi_platform_vendor_ext_provider(sbi_platform_ptr(scratch),
extid, funcid, args,
out_val, out_trap);
}
int sbi_ecall_base_handler(struct sbi_scratch *scratch,
unsigned long extid, unsigned long funcid,
unsigned long *args, unsigned long *out_val,
struct sbi_trap_info *out_trap)
{
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);
break;
default:
ret = SBI_ENOTSUPP;
}
return ret;
}
int sbi_ecall_time_handler(struct sbi_scratch *scratch, unsigned long funcid,
unsigned long *args)
{
int ret = 0;
if (funcid == SBI_EXT_TIME_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
} else
ret = SBI_ENOTSUPP;
return ret;
}
int sbi_ecall_ipi_handler(struct sbi_scratch *scratch, unsigned long funcid,
unsigned long *args, unsigned long *tval)
{
int ret = 0;
if (funcid == SBI_EXT_IPI_SEND_IPI)
ret = sbi_ipi_send_many(scratch, args[0], args[1],
SBI_IPI_EVENT_SOFT, NULL);
else
ret = SBI_ENOTSUPP;
return ret;
}
int sbi_ecall_0_1_handler(struct sbi_scratch *scratch, unsigned long extid,
unsigned long *args, struct sbi_trap_info *out_trap)
{
int ret = 0;
struct sbi_tlb_info tlb_info;
u32 source_hart = sbi_current_hartid();
ulong hmask = 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_load_hart_mask_unpriv(scratch, (ulong *)args[0],
&hmask, out_trap);
if (ret != SBI_ETRAP)
ret = sbi_ipi_send_many(scratch, hmask, 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_load_hart_mask_unpriv(scratch, (ulong *)args[0],
&hmask, out_trap);
if (ret != SBI_ETRAP)
ret = sbi_ipi_send_many(scratch, hmask, 0,
SBI_IPI_EVENT_FENCE,
&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_load_hart_mask_unpriv(scratch, (ulong *)args[0],
&hmask, out_trap);
if (ret != SBI_ETRAP)
ret = sbi_ipi_send_many(scratch, hmask, 0,
SBI_IPI_EVENT_FENCE,
&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_load_hart_mask_unpriv(scratch, (ulong *)args[0],
&hmask, out_trap);
if (ret != SBI_ETRAP)
ret = sbi_ipi_send_many(scratch, hmask, 0,
SBI_IPI_EVENT_FENCE,
&tlb_info);
break;
case SBI_EXT_0_1_SHUTDOWN:
sbi_system_shutdown(scratch, 0);
break;
default:
ret = SBI_ENOTSUPP;
};
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;
struct sbi_trap_info trap = {0};
unsigned long out_val;
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, &trap);
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, &trap);
else if (extension_id == SBI_EXT_TIME)
ret = sbi_ecall_time_handler(scratch, func_id, args);
else if (extension_id == SBI_EXT_IPI)
ret = sbi_ecall_ipi_handler(scratch, func_id, args, &out_val);
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,
&trap);
} else {
ret = SBI_ENOTSUPP;
}
if (ret == SBI_ETRAP) {
trap.epc = regs->mepc;
sbi_trap_redirect(regs, &trap, scratch);
} 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;
}
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