| 27,7 → 27,7 |
|---|
| */ |
| |
| |
| #include <arch/boot/memmap.h> |
| #include <arch/boot/memmapasm.h> |
| |
| E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE |
| E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS |
| 34,30 → 34,34 |
|---|
| E820_SMAP = 0x534d4150 |
| |
| .global memmap_arch_init |
| .global e820counter |
| .global e820table |
| .global e801memorysize |
| |
| .code16 |
| .section K_TEXT_START_2 |
| |
| memmap_arch_init: |
| |
| |
| e820begin: |
| xorl %ebx,%ebx # during first call, ebx must be 0 |
| |
| movw %bx,%ds |
| movw %bx,%es |
| movw $e820table,%di |
| movb $E820_MAX_RECORDS,(e820counter) |
| e820loop: |
| movl $E820_SMAP,%edx # constrol sequence "SMAP" |
| pushw %ds |
| popw %es # e820 buffer address |
| movl $E820_SMAP,%edx # control sequence "SMAP" |
| |
| movl $0xe820,%eax # service |
| movl $0x0000e820,%eax # service |
| movl $E820_RECORD_SIZE,%ecx |
| int $0x15 |
| jc e820end |
| jc e820err |
| |
| |
| cmpl $E820_SMAP,%eax # verifying BIOS |
| jne e820end |
| jne e820err |
| |
| cmpl $E820_RECORD_SIZE,%ecx |
| jne e820err # bad record size - bug in bios |
| |
| movw %di,%ax # next record |
| addw $E820_RECORD_SIZE,%ax |
| 70,17 → 74,52 |
|---|
| jne e820loop |
| |
| e820end: |
| |
| movb (e820counter),%al |
| negb %al |
| addb $32,%al |
| movb $E820_MAX_RECORDS,%al |
| subb (e820counter),%al |
| movb %al,(e820counter) # store # of valid entries in e820counter |
| |
| jmp e801begin |
| |
| e820err: |
| movb $0,(e820counter) |
| |
| # method e801 - get size of memory |
| |
| e801begin: |
| xorw %dx,%dx |
| xorw %cx,%cx |
| xorw %bx,%bx |
| movw $0xe801,%ax |
| stc |
| int $0x15 |
| |
| jc e801end |
| |
| # fix problem with some BIOSes which use ax:bx rather than cx:dx |
| testw %cx,%cx |
| jnz e801cxdx |
| testw %dx,%dx |
| jnz e801cxdx |
| |
| movw %ax,%cx |
| movw %bx,%dx |
| |
| e801cxdx: |
| andl $0xffff,%edx |
| shll $6,%edx |
| andl $0xffff,%ecx |
| addl %ecx,%edx |
| addl $0x0400,%edx # add lower 1 MB - its not count by e801 method |
| movl %edx,(e801memorysize) |
| e801end: |
| ret |
| |
| #memory size in 1 kb chunks |
| e801memorysize: |
| .long 0 |
| |
| e820counter: |
| .byte 0 |
| |
| .byte 0xff |
| |
| e820table: |
| .space (32*E820_RECORD_SIZE),0 # space for 32 records, each E820_RECORD_SIZE bytes long |
| .space (32*E820_RECORD_SIZE),0xff # space for 32 records, each E820_RECORD_SIZE bytes long |