| Felix Held | 4667322 | 2020-04-04 02:37:04 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| Felix Held | 4667322 | 2020-04-04 02:37:04 +0200 | [diff] [blame] | 2 | |
| 3 | #include <cpu/x86/post_code.h> |
| 4 | |
| Kyösti Mälkki | 7522a8f | 2020-11-20 16:47:38 +0200 | [diff] [blame^] | 5 | .section .init, "ax", @progbits |
| 6 | |
| Raul E Rangel | ec26428 | 2020-06-04 16:42:50 -0600 | [diff] [blame] | 7 | .global bootblock_resume_entry |
| 8 | bootblock_resume_entry: |
| 9 | post_code(0xb0) |
| 10 | |
| 11 | /* Get an early timestamp */ |
| 12 | rdtsc |
| 13 | movd %eax, %mm1 |
| 14 | movd %edx, %mm2 |
| 15 | |
| 16 | /* Fall through to bootblock_pre_c_entry */ |
| 17 | |
| Felix Held | 4667322 | 2020-04-04 02:37:04 +0200 | [diff] [blame] | 18 | /* |
| 19 | * on entry: |
| 20 | * mm0: BIST (ignored) |
| 21 | * mm2_mm1: timestamp at bootblock_protected_mode_entry |
| 22 | */ |
| 23 | |
| 24 | .global bootblock_pre_c_entry |
| 25 | bootblock_pre_c_entry: |
| 26 | post_code(0xa0) |
| 27 | |
| Raul E Rangel | 6f1d35e | 2020-06-17 11:10:58 -0600 | [diff] [blame] | 28 | /* Clear .bss section */ |
| 29 | cld |
| 30 | xor %eax, %eax |
| 31 | movl $(_ebss), %ecx |
| 32 | movl $(_bss), %edi |
| 33 | sub %edi, %ecx |
| 34 | shrl $2, %ecx |
| 35 | rep stosl |
| 36 | |
| Felix Held | 4667322 | 2020-04-04 02:37:04 +0200 | [diff] [blame] | 37 | movl $_eearlyram_stack, %esp |
| 38 | |
| 39 | /* Align the stack and keep aligned for call to bootblock_c_entry() */ |
| 40 | and $0xfffffff0, %esp |
| 41 | sub $8, %esp |
| 42 | |
| 43 | movd %mm2, %eax |
| 44 | pushl %eax /* tsc[63:32] */ |
| 45 | movd %mm1, %eax |
| 46 | pushl %eax /* tsc[31:0] */ |
| 47 | |
| 48 | post_code(0xa2) |
| 49 | |
| 50 | call bootblock_c_entry |
| 51 | /* Never reached */ |
| 52 | |
| 53 | .halt_forever: |
| 54 | post_code(POST_DEAD_CODE) |
| 55 | hlt |
| 56 | jmp .halt_forever |