forked from Lephenixnoir/gint
30 lines
907 B
C
30 lines
907 B
C
#include <internals/mmu.h>
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#include <stdint.h>
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/*
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mmu_pseudoTLBInit()
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We need the system to fill the TLB for us, so that it knows what
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happens to its contents. We don't want to edit the TLB ourselves, so
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we'll just read random data from every 4k-page in the rom area to have
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the system virtualize it entirely.
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The index system for TLB entries ensures this process will work for
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128-k or less add-ins. On SH7705 there is a limit, which is 384-k (it
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does probably not exist on SH7305) but there is no guarantee that the
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system will not go wild after 128-k.
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*/
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void mmu_pseudoTLBInit(void)
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{
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extern uint32_t romdata;
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uint32_t limit = (uint32_t)&romdata;
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uint32_t address = 0x00300000;
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// Access every page to make the system load everything in the TLB (and
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// just hope it works and the add-in fits in).
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while(address <= limit)
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{
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*((volatile uint32_t *)address);
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address += 0x1000;
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}
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}
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