| | 1 | # pagingstub-asm.s |
| | 2 | # Paging-enable helper routines |
| | 3 | # NetWatch system management mode administration console |
| | 4 | # |
| | 5 | # Copyright (c) 2008 Jacob Potter and Joshua Wise. All rights reserved. |
| | 6 | # This program is free software; you can redistribute and/or modify it under |
| | 7 | # the terms found in the file LICENSE in the root of this source tree. |
| | 8 | |
| | 9 | .globl set_cr0 |
| | 10 | |
| | 11 | set_cr0: |
| | 12 | mov 4(%esp), %eax # Load argument |
| | 13 | movl %eax, %cr0 # Set CR0 |
| | 14 | pushw %cs # Push 16 bits of %CS |
| | 15 | pushl $set_cr0_cont # Push 32 bits of %EIP |
| | 16 | ljmp *(%esp) # "Far jump" (both %CS and %EIP from stack) |
| | 17 | set_cr0_cont: # Hey, here we are! |
| | 18 | addl $6, %esp # Un-do 48 bits of pushing |
| | 19 | ret |
| | 20 | |
| | 21 | |
| | 22 | .globl ps_switch_stack |
| | 23 | ps_switch_stack: |
| | 24 | mov 4(%esp), %eax |
| | 25 | mov 8(%esp), %esp |
| | 26 | # Put a sentinel value (FEEDFACE) at the top of the stack |
| | 27 | mov $0xCEFAEDFE, %edx |
| | 28 | push %edx |
| | 29 | push %edx |
| | 30 | push %edx |
| | 31 | push %edx |
| | 32 | call *%eax |
| | 33 | rsm |
git.joshuawise.com / netwatch.git / blame_incremental