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lib: Implement SBI v0.2
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
Anup Patel
parent
848ed4f644
commit
0790be0f2c
2 changed files with 139 additions and 31 deletions
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@ -22,8 +22,22 @@ enum sbi_ext_id {
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SBI_EXT_0_1_REMOTE_SFENCE_VMA = 0x6,
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SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID = 0x7,
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SBI_EXT_0_1_SHUTDOWN = 0x8,
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SBI_EXT_BASE = 0x10,
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};
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enum sbi_ext_base_fid {
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SBI_EXT_BASE_GET_SPEC_VERSION = 0,
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SBI_EXT_BASE_GET_IMP_ID,
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SBI_EXT_BASE_GET_IMP_VERSION,
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SBI_EXT_BASE_PROBE_EXT,
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SBI_EXT_BASE_GET_MVENDORID,
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SBI_EXT_BASE_GET_MARCHID,
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SBI_EXT_BASE_GET_MIMPID,
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};
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#define SBI_SPEC_VERSION_MAJOR_OFFSET 24
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#define SBI_SPEC_VERSION_MAJOR_MASK 0x7f
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#define SBI_SPEC_VERSION_MINOR_MASK 0xffffff
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/* clang-format on */
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#endif
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@ -17,9 +17,12 @@
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#include <sbi/sbi_tlb.h>
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#include <sbi/sbi_trap.h>
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#include <sbi/sbi_hart.h>
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#include <sbi/sbi_version.h>
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#include <sbi/riscv_asm.h>
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#define SBI_ECALL_VERSION_MAJOR 0
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#define SBI_ECALL_VERSION_MINOR 1
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#define SBI_ECALL_VERSION_MINOR 2
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#define SBI_OPENSBI_IMPID 1
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u16 sbi_ecall_version_major(void)
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{
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@ -31,34 +34,95 @@ u16 sbi_ecall_version_minor(void)
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return SBI_ECALL_VERSION_MINOR;
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}
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int sbi_ecall_0_1_handler(u32 hartid, struct sbi_trap_regs *regs,
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struct sbi_scratch *scratch,
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struct unpriv_trap *uptrap)
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int sbi_check_extension(struct sbi_scratch *scratch, unsigned long extid,
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unsigned long *out_val)
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{
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/**
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* Each extension apart from base & 0.1, will be implemented as
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* platform specific feature. Thus, extension probing can be achieved
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* by checking the feature bits of the platform. We can create a map
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* between extension ID & feature and use a generic function to check
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* or just use a switch case for every new extension support added
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* TODO: Implement it.
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*/
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if ((extid >= SBI_EXT_0_1_SET_TIMER &&
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extid <= SBI_EXT_0_1_SHUTDOWN) || (extid == SBI_EXT_BASE))
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*out_val = 1;
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else
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*out_val = 0;
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return 0;
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}
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int sbi_ecall_base_handler(struct sbi_scratch *scratch, unsigned long extid,
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unsigned long funcid, unsigned long *args,
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unsigned long *out_val, unsigned long *out_tcause,
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unsigned long *out_tval)
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{
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int ret = 0;
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switch (funcid) {
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case SBI_EXT_BASE_GET_SPEC_VERSION:
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*out_val = (SBI_ECALL_VERSION_MAJOR <<
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SBI_SPEC_VERSION_MAJOR_OFFSET) &
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(SBI_SPEC_VERSION_MAJOR_MASK <<
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SBI_SPEC_VERSION_MAJOR_OFFSET);
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*out_val = *out_val | SBI_ECALL_VERSION_MINOR;
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break;
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case SBI_EXT_BASE_GET_IMP_ID:
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*out_val = SBI_OPENSBI_IMPID;
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break;
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case SBI_EXT_BASE_GET_IMP_VERSION:
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*out_val = OPENSBI_VERSION;
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break;
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case SBI_EXT_BASE_GET_MVENDORID:
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*out_val = csr_read(CSR_MVENDORID);
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break;
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case SBI_EXT_BASE_GET_MARCHID:
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*out_val = csr_read(CSR_MARCHID);
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break;
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case SBI_EXT_BASE_GET_MIMPID:
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*out_val = csr_read(CSR_MIMPID);
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break;
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case SBI_EXT_BASE_PROBE_EXT:
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ret = sbi_check_extension(scratch, args[0], out_val);
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default:
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ret = SBI_ENOTSUPP;
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}
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return ret;
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}
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int sbi_ecall_0_1_handler(struct sbi_scratch *scratch, unsigned long extid,
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unsigned long *args, unsigned long *tval,
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unsigned long *tcause)
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{
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int ret = 0;
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struct sbi_tlb_info tlb_info;
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u32 source_hart = sbi_current_hartid();
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struct unpriv_trap uptrap = {0};
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switch (regs->a7) {
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switch (extid) {
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case SBI_EXT_0_1_SET_TIMER:
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#if __riscv_xlen == 32
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sbi_timer_event_start(scratch,
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(((u64)regs->a1 << 32) | (u64)regs->a0));
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(((u64)args[1] << 32) | (u64)args[0]));
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#else
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sbi_timer_event_start(scratch, (u64)regs->a0);
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sbi_timer_event_start(scratch, (u64)args[0]);
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#endif
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break;
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case SBI_EXT_0_1_CONSOLE_PUTCHAR:
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sbi_putc(regs->a0);
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sbi_putc(args[0]);
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break;
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case SBI_EXT_0_1_CONSOLE_GETCHAR:
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regs->a0 = sbi_getc();
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ret = sbi_getc();
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break;
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case SBI_EXT_0_1_CLEAR_IPI:
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sbi_ipi_clear_smode(scratch);
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break;
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case SBI_EXT_0_1_SEND_IPI:
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ret = sbi_ipi_send_many(scratch, uptrap, (ulong *)regs->a0,
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ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)args[0],
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SBI_IPI_EVENT_SOFT, NULL);
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break;
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case SBI_EXT_0_1_REMOTE_FENCE_I:
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@ -66,26 +130,26 @@ int sbi_ecall_0_1_handler(u32 hartid, struct sbi_trap_regs *regs,
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tlb_info.size = 0;
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tlb_info.type = SBI_ITLB_FLUSH;
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tlb_info.shart_mask = 1UL << source_hart;
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ret = sbi_ipi_send_many(scratch, uptrap, (ulong *)regs->a0,
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ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)args[0],
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SBI_IPI_EVENT_FENCE_I, &tlb_info);
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break;
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case SBI_EXT_0_1_REMOTE_SFENCE_VMA:
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tlb_info.start = (unsigned long)regs->a1;
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tlb_info.size = (unsigned long)regs->a2;
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tlb_info.start = (unsigned long)args[1];
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tlb_info.size = (unsigned long)args[2];
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tlb_info.type = SBI_TLB_FLUSH_VMA;
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tlb_info.shart_mask = 1UL << source_hart;
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ret = sbi_ipi_send_many(scratch, uptrap, (ulong *)regs->a0,
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ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)args[0],
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SBI_IPI_EVENT_SFENCE_VMA, &tlb_info);
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break;
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case SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID:
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tlb_info.start = (unsigned long)regs->a1;
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tlb_info.size = (unsigned long)regs->a2;
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tlb_info.asid = (unsigned long)regs->a3;
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tlb_info.start = (unsigned long)args[1];
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tlb_info.size = (unsigned long)args[2];
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tlb_info.asid = (unsigned long)args[3];
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tlb_info.type = SBI_TLB_FLUSH_VMA_ASID;
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tlb_info.shart_mask = 1UL << source_hart;
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ret = sbi_ipi_send_many(scratch, uptrap, (ulong *)regs->a0,
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ret = sbi_ipi_send_many(scratch, &uptrap, (ulong *)args[0],
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SBI_IPI_EVENT_SFENCE_VMA_ASID,
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&tlb_info);
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break;
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@ -93,9 +157,13 @@ int sbi_ecall_0_1_handler(u32 hartid, struct sbi_trap_regs *regs,
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sbi_system_shutdown(scratch, 0);
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break;
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default:
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regs->a0 = SBI_ENOTSUPP;
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ret = SBI_ENOTSUPP;
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};
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if (ret == SBI_ETRAP) {
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*tcause = uptrap.cause;
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*tval = uptrap.tval;
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}
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return ret;
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}
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@ -103,23 +171,49 @@ int sbi_ecall_handler(u32 hartid, ulong mcause, struct sbi_trap_regs *regs,
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struct sbi_scratch *scratch)
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{
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int ret = 0;
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struct unpriv_trap uptrap;
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u32 extension_id = regs->a7;
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unsigned long extension_id = regs->a7;
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unsigned long func_id = regs->a6;
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unsigned long out_val;
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unsigned long out_tval;
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unsigned long out_tcause;
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bool is_0_1_spec = 0;
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unsigned long args[6];
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args[0] = regs->a0;
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args[1] = regs->a1;
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args[2] = regs->a2;
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args[3] = regs->a3;
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args[4] = regs->a4;
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args[5] = regs->a5;
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if (extension_id >= SBI_EXT_0_1_SET_TIMER &&
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extension_id <= SBI_EXT_0_1_SHUTDOWN) {
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ret = sbi_ecall_0_1_handler(hartid, regs, scratch, &uptrap);
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} else {
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regs->a0 = SBI_ENOTSUPP;
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}
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ret = sbi_ecall_0_1_handler(scratch, extension_id, args,
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&out_tval, &out_tcause);
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is_0_1_spec = 1;
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} else if (extension_id == SBI_EXT_BASE)
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ret = sbi_ecall_base_handler(scratch, extension_id, func_id,
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args, &out_val,
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&out_tval, &out_tcause);
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else
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ret = SBI_ENOTSUPP;
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if (!ret) {
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regs->mepc += 4;
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} else if (ret == SBI_ETRAP) {
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ret = 0;
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if (ret == SBI_ETRAP) {
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sbi_trap_redirect(regs, scratch, regs->mepc,
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uptrap.cause, uptrap.tval);
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out_tcause, out_tval);
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} else {
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/* This function should return non-zero value only in case of
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* fatal error. However, there is no good way to distinguish
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* between a fatal and non-fatal errors yet. That's why we treat
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* every return value except ETRAP as non-fatal and just return
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* accordingly for now. Once fatal errors are defined, that
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* case should be handled differently.
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*/
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regs->mepc += 4;
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regs->a0 = ret;
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if (!is_0_1_spec)
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regs->a1 = out_val;
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}
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return ret;
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return 0;
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}
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