58 lines
1.5 KiB
ArmAsm
58 lines
1.5 KiB
ArmAsm
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// vim: ft=gas:et:sw=12:ts=12:sts=12
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.set SS_CODE16, 0x08
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.set SS_DATA16, 0x10
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.set SS_CODE32, 0x18
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.set SS_DATA32, 0x20
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.macro PROT16
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.code32
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mov $SS_DATA16, %ax
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mov %ax, %ds
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mov %ax, %es
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mov %ax, %ss
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ljmp $SS_CODE16, $9f
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9: .code16
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.endm
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.macro PROT32
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.code16
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mov $SS_DATA32, %ax
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mov %ax, %ds
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mov %ax, %es
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mov %ax, %ss
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ljmp $SS_CODE32, $9f
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9: .code32
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.endm
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.macro REAL
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mov %cr0, %eax
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and $0xFFFE, %ax
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mov %eax, %cr0
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xor %ax, %ax
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mov %ax, %ds
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mov %ax, %es
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mov real_ss, %ax
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mov %ax, %ss
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shl $4, %eax
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sub %eax, %esp
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ljmp $0x0000, $9f
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9:
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.endm
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.macro PROT
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mov %cr0, %eax
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or $1, %eax
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mov %eax, %cr0
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xor %eax, %eax
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mov $SS_DATA16, %ax
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mov %ax, %ds
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mov %ax, %es
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mov %ax, %ss
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mov real_ss, %ax
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shl $4, %eax
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add %eax, %esp
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.endm
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