128 lines
4.0 KiB
C
128 lines
4.0 KiB
C
//---
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// gint:mmu - Memory Management Unit
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//---
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#ifndef GINT_MMU
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#define GINT_MMU
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <gint/mpu/mmu.h>
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#include <stdbool.h>
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//---
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// Unified interface
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//---
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/* mmu_translate(): Get the physical address for a virtual page
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Looks for a translation with the specified virtual address as start, and
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returns the corresponding physical address. Only works if the argument is
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page-aligned.
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@virtual Virtual page address
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@size If provided, set to the size of the page
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Returns the page's physical address, or -1 if not mapped. */
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uint32_t mmu_translate(uint32_t page, uint32_t *size);
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/* mmu_uram(): Get pointer to physical start of user RAM
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Returns a pointer to the physical location behind 0x08100000. The physical
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location can be used to access without the TLB, which is useful when
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interrupts are processed with SR.BL=1. However, the location is highly
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platform-dependent. */
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void *mmu_uram(void);
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/* mmu_uram_size(): Get size of user RAM area
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Returns the size of the static memory at 0x08100000, whose address is
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returned by mmu_uram(). This is typically 8k on SH3 fx-9860G, 32k on SH4
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fx-9860G, and 512k on fx-CG 50. */
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uint32_t mmu_uram_size(void);
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/* mmu_is_rom(): Determine if an address points to ROM
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Checks whether the supplied pointer points to ROM or to a virtualized
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portion of ROM. For the sake of efficiency, this function uses heuristics
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about the structure of P0 rather than actually checking the TLB.
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This is useful during filesystem accesses because only data outside of ROM
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can be written to files. Pointers for which this function returns true
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cannot be used as a source for BFile_Write(). */
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bool mmu_is_rom(void const *ptr);
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//---
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// SH7705 TLB
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//---
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/* tlb_addr() - get the P4 address of a TLB address entry
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@way TLB way (0..3)
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@E Entry number (0..31)
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Returns a pointer to the entry. */
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tlb_addr_t const *tlb_addr(uint way, uint E);
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/* tlb_data() - get the P4 address of a TLB data entry
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@way TLB way (0..3)
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@E Entry number (0..31)
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Returns a pointer to the entry. */
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tlb_data_t const *tlb_data(uint way, uint E);
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/* tlb_mapped_memory() - count amount of mapped memory
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This function returns the amount of mapped text and data segment memory, in
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bytes. The ranges are defined as follows:
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ROM 00300000:512k
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RAM 08100000:512k
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Other mappings are ignored. Both pointers may be NULL.
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@rom Pointer to amount of mapped ROM
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@ram Pointer to amount of mapped RAM */
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void tlb_mapped_memory(uint32_t *p_rom, uint32_t *p_ram);
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/* tlb_translate(): Get the physical address for a virtual page */
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uint32_t tlb_translate(uint32_t page, uint32_t *size);
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//---
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// SH7305 Unified TLB
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//---
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/* utlb_addr() - get the P4 address of a UTLB address entry
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@E Entry number (should be in range 0..63)
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Returns a pointer to the entry. */
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utlb_addr_t const *utlb_addr(uint E);
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/* utlb_data() - get the P4 address of a UTLB data entry
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@E Entry number (should be in range 0..63)
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Returns a pointer to the entry. */
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utlb_data_t const *utlb_data(uint E);
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/* utlb_mapped_memory() - count amount of mapped memory
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This function returns the amount of mapped text and data segment memory, in
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bytes. The ranges are defined as follows:
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ROM 00300000:4M
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RAM 08100000:512k
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Other mappings are ignored. Both pointers may be NULL.
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@rom Pointer to amount of mapped ROM
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@ram Pointer to amount of mapped RAM */
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void utlb_mapped_memory(uint32_t *rom, uint32_t *ram);
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/* utlb_translate(): Get the physical address for a virtual page */
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uint32_t utlb_translate(uint32_t page, uint32_t *size);
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/* itlb_addr(): Get the P4 address of an ITLB address entry
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@E Entry number (0..3)
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Returns a pointer to the entry. */
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itlb_addr_t const *itlb_addr(uint E);
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/* itlb_data(): Get the P4 address of an ITLB data entry
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@E Entry number (0..3)
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Returns a pointer to the entry. */
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itlb_data_t const *itlb_data(uint E);
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#ifdef __cplusplus
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}
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#endif
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#endif /* GINT_MMU */
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