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coreboot-kgpe-d16/src/arch/x86/c_exit.S

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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>
2018-12-09 10:48:59 +01:00
/* SPDX-License-Identifier: GPL-2.0-only */
#include <arch/ram_segs.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/cr.h>
arch/x86: Use ENV_X86_64 instead of _x86_64_ Tested on Intel Sandybridge x86_64 and x86_32. Change-Id: I152483d24af0512c0ee4fbbe8931b7312e487ac6 Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/44867 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
2020-08-27 20:50:18 +02:00
#if ENV_X86_64
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>
2018-12-09 10:48:59 +01:00
/*
* Functions to handle mode switches from long mode to protected
* mode.
*/
.text
.code64
.section ".text.protected_mode_jump", "ax", @progbits
.globl protected_mode_jump
protected_mode_jump:
push %rbp
mov %rsp, %rbp
/* Arguments to stack */
push %rdi
push %rsi
#include <cpu/x86/64bit/exit32.inc>
movl -8(%ebp), %eax /* Function to call */
movl -16(%ebp), %ebx /* Argument 0 */
/* Align the stack */
andl $0xFFFFFFF0, %esp
subl $12, %esp
pushl %ebx /* Argument 0 */
jmp *%eax
#endif