mirror of
https://github.com/AuxXxilium/arc-lkm.git
synced 2024-11-23 23:00:57 +07:00
44 lines
1.7 KiB
C
Executable File
44 lines
1.7 KiB
C
Executable File
/**
|
|
* TODO: look into override_symbol to check if there's any docs
|
|
*/
|
|
#include "memory_helper.h"
|
|
#include "../../common.h"
|
|
#include "../call_protected.h" //_flush_tlb_all()
|
|
#include <asm/cacheflush.h> //PAGE_ALIGN
|
|
#include <asm/page_types.h> //PAGE_SIZE
|
|
#include <asm/pgtable_types.h> //_PAGE_RW
|
|
|
|
#define PAGE_ALIGN_BOTTOM(addr) (PAGE_ALIGN(addr) - PAGE_SIZE) //aligns the memory address to bottom of the page boundary
|
|
#define NUM_PAGES_BETWEEN(low, high) (((PAGE_ALIGN_BOTTOM(high) - PAGE_ALIGN_BOTTOM(low)) / PAGE_SIZE) + 1)
|
|
|
|
void set_mem_addr_rw(const unsigned long vaddr, unsigned long len)
|
|
{
|
|
unsigned long addr = PAGE_ALIGN_BOTTOM(vaddr);
|
|
pr_loc_dbg("Disabling memory protection for page(s) at %p+%lu/%u (<<%p)", (void *) vaddr, len,
|
|
(unsigned int) NUM_PAGES_BETWEEN(vaddr, vaddr + len), (void *) addr);
|
|
|
|
//theoretically this should use set_pte_atomic() but we're touching pages that will not be modified by anything else
|
|
unsigned int level;
|
|
for(; addr <= vaddr; addr += PAGE_SIZE) {
|
|
pte_t *pte = lookup_address(addr, &level);
|
|
pte->pte |= _PAGE_RW;
|
|
}
|
|
|
|
_flush_tlb_all();
|
|
}
|
|
|
|
void set_mem_addr_ro(const unsigned long vaddr, unsigned long len)
|
|
{
|
|
unsigned long addr = PAGE_ALIGN_BOTTOM(vaddr);
|
|
pr_loc_dbg("Enabling memory protection for page(s) at %p+%lu/%u (<<%p)", (void *) vaddr, len,
|
|
(unsigned int) NUM_PAGES_BETWEEN(vaddr, vaddr + len), (void *) addr);
|
|
|
|
//theoretically this should use set_pte_atomic() but we're touching pages that will not be modified by anything else
|
|
unsigned int level;
|
|
for(; addr <= vaddr; addr += PAGE_SIZE) {
|
|
pte_t *pte = lookup_address(addr, &level);
|
|
pte->pte &= ~_PAGE_RW;
|
|
}
|
|
|
|
_flush_tlb_all();
|
|
} |