59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
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#include <socks/vm.h>
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#include <socks/memblock.h>
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#include <socks/printk.h>
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/* array of pages, one for each physical page frame present in RAM */
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static vm_page_t *page_array = NULL;
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/* number of pages stored in page_array */
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static size_t page_array_count = 0;
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void vm_flat_init()
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{
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printk("vm: using flat memory model");
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size_t pmem_size = 0;
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memblock_iter_t it;
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for_each_free_mem_range (&it, 0x0, UINTPTR_MAX) {
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if (pmem_size < it.it_limit + 1) {
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pmem_size = it.it_limit + 1;
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}
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}
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size_t nr_pages = pmem_size / VM_PAGE_SIZE;
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if (pmem_size % VM_PAGE_SIZE) {
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nr_pages++;
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}
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page_array = memblock_alloc(sizeof(vm_page_t) * nr_pages, 8);
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page_array_count = nr_pages;
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size_t nr_reserved = nr_pages;
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for (size_t i = 0; i < nr_pages; i++) {
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page_array[i].p_flags = VM_PAGE_RESERVED;
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}
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for_each_free_mem_range(&it, 0x0, UINTPTR_MAX) {
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for (uintptr_t i = it.it_base; i < it.it_limit; i += VM_PAGE_SIZE) {
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size_t pfn = i / VM_PAGE_SIZE;
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page_array[pfn].p_flags = 0;
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nr_reserved--;
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}
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}
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printk("vm: page array has %zu pages, %zu reserved", nr_pages, nr_reserved);
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}
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vm_page_t *vm_page_get_flat(phys_addr_t addr)
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{
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size_t pfn = addr / VM_PAGE_SIZE;
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return pfn < page_array_count ? &page_array[pfn] : NULL;
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}
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size_t vm_page_get_pfn_flat(vm_page_t *pg)
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{
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return ((uintptr_t)pg - (uintptr_t)page_array) / sizeof *pg;
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}
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