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| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2024-02-05 23:22:00 +0100 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2024-02-05 23:22:00 +0100 |
| commit | 429762dca4d313140067d14e1c448ee68d1644d2 (patch) | |
| tree | b91e1abc297e58440894855007f80023b8f385ef /i386/i386at/model_dep.c | |
| parent | e211bdce3388a3c9e3dafab903dd53374f6d9759 (diff) | |
| download | gnumach-429762dca4d313140067d14e1c448ee68d1644d2.tar.gz gnumach-429762dca4d313140067d14e1c448ee68d1644d2.tar.bz2 gnumach-429762dca4d313140067d14e1c448ee68d1644d2.zip | |
apboot: avoid self-modifying code
self-modifying code is generally frowned upon, Intel largely says the
support is model-dependent. We can as well just relocate from the C
code like we did for the temporary gdt.
Diffstat (limited to 'i386/i386at/model_dep.c')
| -rw-r--r-- | i386/i386at/model_dep.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/i386/i386at/model_dep.c b/i386/i386at/model_dep.c index e0995c96..173b99f5 100644 --- a/i386/i386at/model_dep.c +++ b/i386/i386at/model_dep.c @@ -129,6 +129,9 @@ extern char version[]; /* Realmode temporary GDT */ extern struct pseudo_descriptor gdt_descr_tmp; +/* Realmode relocated jmp */ +extern uint32_t apboot_jmp_offset; + /* If set, reboot the system on ctrl-alt-delete. */ boolean_t rebootflag = FALSE; /* exported to kdintr */ @@ -221,9 +224,11 @@ void machine_init(void) assert (apboot_addr < 0x100000); /* - * Patch the realmode gdt with the correct offset + * Patch the realmode gdt with the correct offset and the first jmp to + * protected mode with the correct target. */ gdt_descr_tmp.linear_base += apboot_addr; + apboot_jmp_offset += apboot_addr; #endif } |