diff options
| author | Simon Glass <sjg@chromium.org> | 2014-10-10 08:21:55 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2014-10-28 20:43:47 -0600 |
| commit | 200182a748afd430da97b707dc5dff53c3147b5f (patch) | |
| tree | 6552542960e3ed576811f85ba8431d1566542c32 /arch/x86/include/asm/cpu.h | |
| parent | 92cc94a1fe8e7a3ec78e993ea1ff1dd0bbaa5c36 (diff) | |
x86: Add support for starting 64-bit kernel
Add code to jump to a 64-bit Linux kernel. We need to set up a flat page
table structure, a new GDT and then go through a few hoops in the right
order.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/x86/include/asm/cpu.h')
| -rw-r--r-- | arch/x86/include/asm/cpu.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h index 32930bd8c5..6c6774af76 100644 --- a/arch/x86/include/asm/cpu.h +++ b/arch/x86/include/asm/cpu.h @@ -26,4 +26,30 @@ void cpu_disable_paging_pae(void); */ int cpu_has_64bit(void); +/** + * cpu_call64() - Jump to a 64-bit Linux kernel (internal function) + * + * The kernel is uncompressed and the 64-bit entry point is expected to be + * at @target. + * + * This function is used internally - see cpu_jump_to_64bit() for a more + * useful function. + * + * @pgtable: Address of 24KB area containing the page table + * @setup_base: Pointer to the setup.bin information for the kernel + * @target: Pointer to the start of the kernel image + */ +void cpu_call64(ulong pgtable, ulong setup_base, ulong target); + +/** + * cpu_jump_to_64bit() - Jump to a 64-bit Linux kernel + * + * The kernel is uncompressed and the 64-bit entry point is expected to be + * at @target. + * + * @setup_base: Pointer to the setup.bin information for the kernel + * @target: Pointer to the start of the kernel image + */ +int cpu_jump_to_64bit(ulong setup_base, ulong target); + #endif |