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| author | Wesley W. Terpstra <wesley@sifive.com> | 2018-03-05 14:59:44 -0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2018-03-05 14:59:44 -0800 |
| commit | 2bbd8e1a1bccae13ec87882baf423abfc6ef76fd (patch) | |
| tree | 95453fbde3440dc2dbc67ba55fc0a9da7fd2555b /machine | |
| parent | e5846a2bc707eaa58dc8ab6a8d20a090c6ee8570 (diff) | |
| download | pk-2bbd8e1a1bccae13ec87882baf423abfc6ef76fd.zip pk-2bbd8e1a1bccae13ec87882baf423abfc6ef76fd.tar.gz pk-2bbd8e1a1bccae13ec87882baf423abfc6ef76fd.tar.bz2 | |
mtrap: add a halt IPI used for poweroff (#86)
Otherwise, linux complains the moment an interrupt arrives and
wakes up one of the not-looping cores.
Diffstat (limited to 'machine')
| -rw-r--r-- | machine/mentry.S | 5 | ||||
| -rw-r--r-- | machine/mtrap.c | 23 | ||||
| -rw-r--r-- | machine/mtrap.h | 1 |
3 files changed, 18 insertions, 11 deletions
diff --git a/machine/mentry.S b/machine/mentry.S index 41d7017..3dcf2b6 100644 --- a/machine/mentry.S +++ b/machine/mentry.S @@ -91,6 +91,11 @@ trap_vector: beqz a1, 1f sfence.vma 1: + andi a1, a0, IPI_HALT + beqz a1, 1f + wfi + j 1b +1: j .Lmret diff --git a/machine/mtrap.c b/machine/mtrap.c index 778990f..b8dcc68 100644 --- a/machine/mtrap.c +++ b/machine/mtrap.c @@ -31,17 +31,6 @@ static uintptr_t mcall_console_putchar(uint8_t ch) return 0; } -void poweroff(uint16_t code) -{ - printm("Power off\n"); - finisher_exit(code); - if (htif) { - htif_poweroff(); - } else { - while (1) { asm volatile ("#noop\n"); } - } -} - void putstring(const char* s) { while (*s) @@ -229,3 +218,15 @@ void trap_from_machine_mode(uintptr_t* regs, uintptr_t dummy, uintptr_t mepc) bad_trap(regs, dummy, mepc); } } + +void poweroff(uint16_t code) +{ + printm("Power off\r\n"); + finisher_exit(code); + if (htif) { + htif_poweroff(); + } else { + send_ipi_many(0, IPI_HALT); + while (1) { asm volatile ("wfi\n"); } + } +} diff --git a/machine/mtrap.h b/machine/mtrap.h index eafdb14..c4d43d0 100644 --- a/machine/mtrap.h +++ b/machine/mtrap.h @@ -78,6 +78,7 @@ static inline void wfi() #define IPI_SOFT 0x1 #define IPI_FENCE_I 0x2 #define IPI_SFENCE_VMA 0x4 +#define IPI_HALT 0x8 #define MACHINE_STACK_SIZE RISCV_PGSIZE #define MENTRY_HLS_OFFSET (INTEGER_CONTEXT_SIZE + SOFT_FLOAT_CONTEXT_SIZE) |