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Allow for 2MiB large pages

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This commit is contained in:
Justin C. Miller
2018-05-18 23:21:37 -07:00
parent 4005e9e791
commit 0ddcf668cb
3 changed files with 57 additions and 20 deletions
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19
src/kernel/memory_bootstrap.cpp
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@@ -4,6 +4,7 @@
#include "page_manager.h"
const unsigned efi_page_size = 0x1000;
const unsigned ident_page_flags = 0xf; // TODO: set to 0xb when user/kernel page tables are better sorted
enum class efi_memory_type : uint32_t
{
@@ -306,7 +307,7 @@ copy_new_table(page_table *base, unsigned index, page_table *new_table)
for (int i = 0; i < 512; ++i) new_table->entries[i] = 0;
}
base->entries[index] = reinterpret_cast<uint64_t>(new_table) | 0xb;
base->entries[index] = reinterpret_cast<uint64_t>(new_table) | ident_page_flags;
}
static uint64_t
@@ -363,7 +364,7 @@ check_needs_page_ident(page_table *table, unsigned index, page_table **free_page
page_table *new_table = (*free_pages)++;
for (int i=0; i<512; ++i) new_table->entries[i] = 0;
table->entries[index] = reinterpret_cast<uint64_t>(new_table) | 0xb;
table->entries[index] = reinterpret_cast<uint64_t>(new_table) | ident_page_flags;
return 1;
}
@@ -390,12 +391,24 @@ page_in_ident(
tables[1]->entries[idx[1]] & ~0xfffull);
for (; idx[2] < 512; idx[2] += 1, idx[3] = 0) {
if (idx[3] == 0 &&
count >= 512 &&
tables[2]->get(idx[2]) == nullptr) {
// Do a 2MiB page instead
tables[2]->entries[idx[2]] = phys_addr | 0x80 | ident_page_flags;
phys_addr += page_manager::page_size * 512;
count -= 512;
if (count == 0) return pages_consumed;
continue;
}
pages_consumed += check_needs_page_ident(tables[2], idx[2], &free_pages);
tables[3] = reinterpret_cast<page_table *>(
tables[2]->entries[idx[2]] & ~0xfffull);
for (; idx[3] < 512; idx[3] += 1) {
tables[3]->entries[idx[3]] = phys_addr | 0xb;
tables[3]->entries[idx[3]] = phys_addr | ident_page_flags;
phys_addr += page_manager::page_size;
if (--count == 0) return pages_consumed;
}