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Added support for page types in mmgr

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This commit is contained in:
ngiddings
2021-04-19 06:55:27 -05:00
parent a5e9d852ab
commit 470e39e8e8
2 changed files with 35 additions and 5 deletions
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15
include/mmgr.h
View File

@@ -10,6 +10,13 @@ enum page_flag_t
PAGE_USERMODE = 1 << 2
};
enum page_type_t
{
PAGE_NOT_PRESENT = 0,
PAGE_ANON = 1,
PAGE_COPY_ON_WRITE = 2
};
extern const size_t page_size;
/**
@@ -55,3 +62,11 @@ int map_page(struct page_stack_t *page_stack, void *page, physaddr_t frame, int
* @return physaddr_t
*/
physaddr_t unmap_page(void *page);
/**
* @brief
*
* @param page
* @return enum page_type_t
*/
enum page_type_t page_type(void *page);

25
src/x86/mmgr.c
View File

@@ -20,7 +20,7 @@ struct page_table_entry_t
uint32_t pat : 1;
uint32_t global : 1;
uint32_t shared : 1;
uint32_t ignored : 2;
uint32_t type : 2;
uint32_t physical_address : 20;
};
@@ -32,7 +32,7 @@ int start_paging(physaddr_t start, physaddr_t end, uint32_t *directory, uint32_t
{
physaddr_t p = start;
size_t count = 0;
while(p < end)
while (p < end)
{
uint32_t table_entry = p + 3;
int index = p / page_size;
@@ -42,7 +42,7 @@ int start_paging(physaddr_t start, physaddr_t end, uint32_t *directory, uint32_t
count++;
}
directory[0] = ((uint32_t)identity_table) + 3;
directory[1022] = ((uint32_t)table) + 3;
directory[1022] = ((uint32_t)table) + 3 + 1024;
directory[1023] = ((uint32_t)directory) + 3;
asm("mov %0, %%cr3"
:
@@ -115,6 +115,7 @@ int map_page(struct page_stack_t *page_stack, void *page, physaddr_t frame, int
page_tables[table_index].present = 1;
page_tables[table_index].usermode = (flags & PAGE_USERMODE) ? 1 : 0;
page_tables[table_index].rw = (flags & PAGE_RW) ? 1 : 0;
page_tables[table_index].type = PAGE_ANON;
asm volatile("invlpg (%0)"
:
: "r"(page)
@@ -126,7 +127,7 @@ physaddr_t unmap_page(void *page)
{
if ((size_t)page % page_size != 0)
{
return S_OUT_OF_BOUNDS;
return S_INVALID_ARGUMENT;
}
size_t table_index = (size_t)page / page_size;
size_t directory_index = table_index / (page_size / sizeof(struct page_table_entry_t));
@@ -144,4 +145,18 @@ physaddr_t unmap_page(void *page)
: "memory");
return frame;
}
}
}
enum page_type_t page_type(void *page)
{
size_t table_index = (size_t)page / page_size;
size_t directory_index = table_index / (page_size / sizeof(struct page_table_entry_t));
if (!page_directory[directory_index].present || !page_tables[table_index].present)
{
return PAGE_NOT_PRESENT;
}
else
{
return page_tables[table_index].type;
}
}