diff options
| author | dzwdz | 2021-10-15 17:25:12 +0200 |
|---|---|---|
| committer | dzwdz | 2021-10-15 17:25:12 +0200 |
| commit | 946313af5905ac3679c1f496f000ba077ce038f0 (patch) | |
| tree | bfed3f993ae97c3a72a945382c8686ad0ad2b832 /src/kernel/arch | |
| parent | d994f9517785aeba4a07ec8c4aecf6d5d969ab97 (diff) | |
kernel: quit QEMU once there are no running processes left
Diffstat (limited to 'src/kernel/arch')
| -rw-r--r-- | src/kernel/arch/generic.h | 2 | ||||
| -rw-r--r-- | src/kernel/arch/i386/boot.s | 10 |
2 files changed, 12 insertions, 0 deletions
diff --git a/src/kernel/arch/generic.h b/src/kernel/arch/generic.h index bbbb49f..fcc228e 100644 --- a/src/kernel/arch/generic.h +++ b/src/kernel/arch/generic.h @@ -15,6 +15,8 @@ extern char _bss_end; __attribute__((noreturn)) void halt_cpu(void); +__attribute__((noreturn)) +void cpu_shutdown(void); // src/arch/i386/sysenter.s _Noreturn void sysexit(struct registers); diff --git a/src/kernel/arch/i386/boot.s b/src/kernel/arch/i386/boot.s index 0101b40..9fd7d5d 100644 --- a/src/kernel/arch/i386/boot.s +++ b/src/kernel/arch/i386/boot.s @@ -7,6 +7,16 @@ _start: push %ebx // address of the Multiboot struct call kmain_early +.global cpu_shutdown +.type cpu_shutdown, @function +cpu_shutdown: +/* This quits QEMU. While I couldn't find this officially documented anywhere, + * it is used by QEMU in tests/tcg/i386/system/boot.S (as of commit 40d6ee), so + * I assume that this is safe-ish to use */ + mov $0x604, %edx + mov $0x2000, %eax + outw %ax, %dx + .global halt_cpu .type halt_cpu, @function halt_cpu: |