diff options
Diffstat (limited to 'src/arch/x86/c_exit.S')
| -rw-r--r-- | src/arch/x86/c_exit.S | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/arch/x86/c_exit.S b/src/arch/x86/c_exit.S new file mode 100644 index 0000000000..e5b9bf8d74 --- /dev/null +++ b/src/arch/x86/c_exit.S @@ -0,0 +1,38 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <arch/ram_segs.h> +#include <cpu/x86/msr.h> +#include <cpu/x86/cr.h> + + +#ifdef __x86_64__ + + /* + * 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 |