61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
#pragma once
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#include <stdint.h>
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//in the lower half, memory is only ever mapped below 0x0080.0000.0000. this is
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//one p3's worth. the p4 and p3 in app_memory are always real, but p3 may have
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//zero entries indicating p2's that aren't needed. similarly, the p2's may have
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//zero entries indicating p1's that aren't needed.
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namespace hilbert::kernel {
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class app_memory {
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typedef uint64_t *v_page_table;
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v_page_table p4;
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v_page_table p3;
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v_page_table p2s[512];
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v_page_table *p1s[512];
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bool **pram_pages_to_free_on_exit[512];
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public:
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uint64_t p4_paddr;
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app_memory();
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~app_memory();
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//vaddr and paddr must be page aligned.
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//vaddr must be < 0x0080.0000.0000.
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void map_page(
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uint64_t vaddr, uint64_t paddr, bool write,
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bool execute, bool free_pram_on_exit);
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//also frees the pram if marked in pram_pages_to_free_on_exit
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void unmap_page(uint64_t vaddr);
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bool valid_to_read(
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uint64_t vaddr_start, uint64_t vaddr_end, bool and_write) const;
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inline bool valid_to_read(
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const void *vaddr_start, const void *vaddr_end, bool and_write) const {
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return valid_to_read(
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(uint64_t)vaddr_start, (uint64_t)vaddr_end, and_write);
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}
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//pages are together; returns start of first page.
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//only looks in range [0x0000.0000.1000, 0x0040.0000.0000)
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uint64_t get_free_vaddr_pages(uint64_t count);
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//returns top of stack
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uint64_t map_new_stack();
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//also frees pram pages
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void unmap_stack(uint64_t top);
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//in lower half
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uint64_t count_mapped_vram_pages() const;
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};
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}
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