61 lines
1.3 KiB
ArmAsm
61 lines
1.3 KiB
ArmAsm
#define BAT_SETUP_HOOK_ADDR 0xFFF1D624
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#define BAT_SETUP_HOOK_ENTRY 0x00FFF000
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.globl KernelPatchesFinal
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KernelPatchesFinal:
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# store the old DBAT0
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mfdbatu r5, 0
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mfdbatl r6, 0
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# memory barrier
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eieio
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isync
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# setup DBAT0 for access to kernel code memory
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lis r3, 0xFFF0
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ori r3, r3, 0x0002
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mtdbatu 0, r3
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lis r3, 0xFFF0
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ori r3, r3, 0x0032
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mtdbatl 0, r3
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# memory barrier
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eieio
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isync
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# SaveAndResetDataBATs_And_SRs hook setup, but could be any BAT function though
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# just chosen because its simple
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lis r3, BAT_SETUP_HOOK_ADDR@h
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ori r3, r3, BAT_SETUP_HOOK_ADDR@l
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lis r4, (BAT_SETUP_HOOK_ENTRY | 0x48000003)@h # bla BAT_SETUP_HOOK_ENTRY
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ori r4, r4, (BAT_SETUP_HOOK_ENTRY | 0x48000003)@l
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stw r4, 0x24(r3)
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# flush and invalidate the replaced instructions
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lis r3, (BAT_SETUP_HOOK_ADDR & ~31)@h
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ori r3, r3, (BAT_SETUP_HOOK_ADDR & ~31)@l
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dcbf 0, r3
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icbi 0, r3
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lis r3, ((BAT_SETUP_HOOK_ADDR + 0x40) & ~31)@h
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ori r3, r3, ((BAT_SETUP_HOOK_ADDR + 0x40) & ~31)@l
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dcbf 0, r3
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icbi 0, r3
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sync
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# memory barrier
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eieio
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isync
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# restore DBAT 0 and return from interrupt
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mtdbatu 0, r5
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mtdbatl 0, r6
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# memory barrier
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eieio
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isync
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blr
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