lby/lk
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[platform][qemu-riscv] add simple hard coded support for poweroff and reset

Browse Source 
Writing to a particular address will tell qemu to poweroff or reset.
This commit is contained in:
Travis Geiselbrecht
2020-11-12 03:04:35 -08:00
parent f893499029
commit 54955fb7f7
2 changed files with 41 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
platform/qemu-virt-riscv/platform.c
View File

@@ -25,6 +25,9 @@
#else
#include <kernel/novm.h>
#endif
#if WITH_LIB_CONSOLE
#include <lib/console.h>
#endif
#include "platform_p.h"
@@ -43,6 +46,8 @@ static pmm_arena_t arena = {
};
#endif
static volatile uint32_t *power_reset_reg;
// callbacks to the fdt_walk routine
static void memcallback(uint64_t base, uint64_t len, void *cookie) {
bool *found_mem = (bool *)cookie;
@@ -114,8 +119,15 @@ void platform_early_init(void) {
pmm_alloc_range(MEMBASE, 0x20000 / PAGE_SIZE, &list);
#endif
LTRACEF("done scanning FDT\n");
/* save a copy of the pointer to the poweroff/reset register */
/* TODO: read it from the FDT */
#if WITH_KERNEL_VM
power_reset_reg = paddr_to_kvaddr(0x100000);
#else
power_reset_reg = (void *)0x100000;
#endif
}
void platform_init(void) {
@@ -153,3 +165,30 @@ void platform_init(void) {
#endif
}
void platform_halt(platform_halt_action suggested_action,
platform_halt_reason reason) {
switch (suggested_action) {
case HALT_ACTION_SHUTDOWN:
dprintf(ALWAYS, "Shutting down... (reason = %d)\n", reason);
*power_reset_reg = 0x5555;
break;
case HALT_ACTION_REBOOT:
dprintf(ALWAYS, "Rebooting... (reason = %d)\n", reason);
*power_reset_reg = 0x7777;
break;
case HALT_ACTION_HALT:
#if ENABLE_PANIC_SHELL
if (reason == HALT_REASON_SW_PANIC) {
dprintf(ALWAYS, "CRASH: starting debug shell... (reason = %d)\n", reason);
arch_disable_ints();
panic_shell_start();
}
#endif // ENABLE_PANIC_SHELL
dprintf(ALWAYS, "HALT: spinning forever... (reason = %d)\n", reason);
break;
}
arch_disable_ints();
for (;;)
arch_idle();
}