STD
REP; MOVSB
MOVL BX, multibootptr-KZERO(SB)
- MOVL $_startPADDR(SB), AX
- ANDL $~KZERO, AX
+ MOVL $_startPADDR-KZERO(SB), AX
JMP* AX
/* multiboot structure pointer (physical address) */
CLI /* make sure interrupts are off */
/* set up the gdt so we have sane plan 9 style gdts. */
- MOVL $tgdtptr(SB), AX
- ANDL $~KZERO, AX
+ MOVL $tgdtptr-KZERO(SB), AX
MOVL (AX), GDTR
MOVW $1, AX
MOVW AX, MSW
WORD $(3*8)
LONG $tgdt-KZERO(SB)
-TEXT m0rgdtptr(SB), $0
- WORD $(NGDT*8-1)
- LONG $(CPU0GDT-KZERO)
-
-TEXT m0gdtptr(SB), $0
- WORD $(NGDT*8-1)
- LONG $CPU0GDT
-
-TEXT m0idtptr(SB), $0
- WORD $(256*8-1)
- LONG $IDTADDR
+TEXT vtgdtptr(SB), $0
+ WORD $(3*8)
+ LONG $tgdt(SB)
TEXT mode32bit(SB), $0
- /* At this point, the GDT setup is done. */
-
MOVL $((CPU0END-CPU0PDB)>>2), CX
MOVL $PADDR(CPU0PDB), DI
XORL AX, AX
* be initialised here.
*/
TEXT _startpg(SB), $0
+ MOVL $vtgdtptr(SB), AX
+ MOVL (AX), GDTR
+
MOVL $0, (PDO(0))(CX) /* undo double-map of KZERO at 0 */
MOVL CX, CR3 /* load and flush the mmu */
/* fault-proof memcpy */
TEXT peek(SB), $0
- MOVL $0, AX /* AX set to -1 if traped */
MOVL src+0(FP), SI
MOVL dst+4(FP), DI
MOVL cnt+8(FP), CX
CLD
TEXT _peekinst(SB), $0
REP; MOVSB
+ MOVL CX, AX
RET
/*
* a 386 (Ac bit can't be set). If it's not a 386 and the Id bit can't be
* toggled then it's an older 486 of some kind.
*
- * cpuid(fun, regs[4]);
+ * cpuid(fn, sublvl, regs[4]);
*/
TEXT cpuid(SB), $0
MOVL $0x240000, AX
TESTL $0x200000, AX /* Id */
JZ _cpu486 /* can't toggle this bit on some 486 */
MOVL fn+0(FP), AX
+ MOVL sublvl+4(FP), CX
CPUID
JMP _cpuid
_cpu486:
XORL CX, CX
XORL DX, DX
_cpuid:
- MOVL regs+4(FP), BP
+ MOVL regs+8(FP), BP
MOVL AX, 0(BP)
MOVL BX, 4(BP)
MOVL CX, 8(BP)