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lib: Implement SBI v0.2

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SBI v0.2 introduces a base specification which is mandatory to
implement for any SBI implementations that is not legacy.

Add support for the base extension.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra 2019-10-02 13:59:39 -07:00 committed by Anup Patel
parent 848ed4f644
commit 0790be0f2c
2 changed files with 139 additions and 31 deletions
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14
include/sbi/sbi_ecall_interface.h
View File

@ -22,8 +22,22 @@ enum sbi_ext_id {
SBI_EXT_0_1_REMOTE_SFENCE_VMA = 0x6,
SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID = 0x7,
SBI_EXT_0_1_SHUTDOWN = 0x8,
SBI_EXT_BASE = 0x10,
};
enum sbi_ext_base_fid {
SBI_EXT_BASE_GET_SPEC_VERSION = 0,
SBI_EXT_BASE_GET_IMP_ID,
SBI_EXT_BASE_GET_IMP_VERSION,
SBI_EXT_BASE_PROBE_EXT,
SBI_EXT_BASE_GET_MVENDORID,
SBI_EXT_BASE_GET_MARCHID,
SBI_EXT_BASE_GET_MIMPID,
};
#define SBI_SPEC_VERSION_MAJOR_OFFSET 24
#define SBI_SPEC_VERSION_MAJOR_MASK 0x7f
#define SBI_SPEC_VERSION_MINOR_MASK 0xffffff
/* clang-format on */
#endif

156
lib/sbi/sbi_ecall.c
View File

@ -17,9 +17,12 @@
#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 1
#define SBI_ECALL_VERSION_MINOR 2
#define SBI_OPENSBI_IMPID 1
u16 sbi_ecall_version_major(void)
{
@ -31,34 +34,95 @@ u16 sbi_ecall_version_minor(void)
return SBI_ECALL_VERSION_MINOR;
}
int sbi_ecall_0_1_handler(u32 hartid, struct sbi_trap_regs *regs,
struct sbi_scratch *scratch,
struct unpriv_trap *uptrap)
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
*out_val = 0;
return 0;
}
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 (regs->a7) {
switch (extid) {
case SBI_EXT_0_1_SET_TIMER:
#if __riscv_xlen == 32
sbi_timer_event_start(scratch,
(((u64)regs->a1 << 32) | (u64)regs->a0));
(((u64)args[1] << 32) | (u64)args[0]));
#else
sbi_timer_event_start(scratch, (u64)regs->a0);
sbi_timer_event_start(scratch, (u64)args[0]);
#endif
break;
case SBI_EXT_0_1_CONSOLE_PUTCHAR:
sbi_putc(regs->a0);
sbi_putc(args[0]);
break;
case SBI_EXT_0_1_CONSOLE_GETCHAR:
regs->a0 = sbi_getc();
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 *)regs->a0,
ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)args[0],
SBI_IPI_EVENT_SOFT, NULL);
break;
case SBI_EXT_0_1_REMOTE_FENCE_I:
@ -66,26 +130,26 @@ int sbi_ecall_0_1_handler(u32 hartid, struct sbi_trap_regs *regs,
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 *)regs->a0,
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)regs->a1;
tlb_info.size = (unsigned long)regs->a2;
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 *)regs->a0,
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)regs->a1;
tlb_info.size = (unsigned long)regs->a2;
tlb_info.asid = (unsigned long)regs->a3;
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 *)regs->a0,
ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)args[0],
SBI_IPI_EVENT_SFENCE_VMA_ASID,
&tlb_info);
break;
@ -93,9 +157,13 @@ int sbi_ecall_0_1_handler(u32 hartid, struct sbi_trap_regs *regs,
sbi_system_shutdown(scratch, 0);
break;
default:
regs->a0 = SBI_ENOTSUPP;
ret = SBI_ENOTSUPP;
};
if (ret == SBI_ETRAP) {
*tcause = uptrap.cause;
*tval = uptrap.tval;
}
return ret;
}
@ -103,23 +171,49 @@ int sbi_ecall_handler(u32 hartid, ulong mcause, struct sbi_trap_regs *regs,
struct sbi_scratch *scratch)
{
int ret = 0;
struct unpriv_trap uptrap;
u32 extension_id = regs->a7;
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(hartid, regs, scratch, &uptrap);
} else {
regs->a0 = SBI_ENOTSUPP;
}
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
ret = SBI_ENOTSUPP;
if (!ret) {
regs->mepc += 4;
} else if (ret == SBI_ETRAP) {
ret = 0;
if (ret == SBI_ETRAP) {
sbi_trap_redirect(regs, scratch, regs->mepc,
uptrap.cause, uptrap.tval);
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 ret;
return 0;
}