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| author | Patrick Rudolph <siro@das-labor.org> | 2018-12-09 10:48:59 +0100 |
|---|---|---|
| committer | Patrick Rudolph <siro@das-labor.org> | 2020-08-19 09:06:43 +0000 |
| commit | e563815e059ef5881a42e6f8b37094783771d5a7 (patch) | |
| tree | 7641211d03c315d37176717cbf37588ec4ebd38b /src/include | |
| parent | ad7b2e23ab5954f150a4b2f62378f1e7133e56c9 (diff) | |
| download | coreboot-e563815e059ef5881a42e6f8b37094783771d5a7.tar.xz | |
arch/x86/boot: Jump to payload in protected mode
* On ARCH_RAMSTAGE_X86_64 jump to the payload in protected mode.
* Add a helper function to jump to arbitrary code in protected mode,
similar to the real mode call handler.
* Doesn't affect existing x86_32 code.
* Add a macro to cast pointer to uint32_t that dies if it would overflow
on conversion
Tested on QEMU Q35 using SeaBIOS as payload.
Tested on Lenovo T410 with additional x86_64 patches.
Change-Id: I6552ac30f1b6205e08e16d251328e01ce3fbfd14
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/30118
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/assert.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/include/assert.h b/src/include/assert.h index 262b8cc761..944c67768a 100644 --- a/src/include/assert.h +++ b/src/include/assert.h @@ -80,4 +80,15 @@ extern void _dead_code_assertion_failed(void) __attribute__((noreturn)); *(type *)(uintptr_t)0; \ }) +#ifdef __x86_64__ +#define pointer_to_uint32_safe(x) ({ \ + if ((uintptr_t)(x) > 0xffffffffUL) \ + die("Cast from pointer to uint32_t overflows"); \ + (uint32_t)(uintptr_t)(x); \ +}) +#else +#define pointer_to_uint32_safe(x) ({ \ + (uint32_t)(uintptr_t)(x); \ +}) +#endif #endif // __ASSERT_H__ |