Bananymous
/
banan-os
1
1
Fork 1
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Kernel: remove PAGE_FLAGS_MASK as that was not correct anymore 

After I added NXE bit, the flags mask is no longer valid
This commit is contained in:
Bananymous 2023-07-21 12:01:50 +03:00
parent 46eb27883a
commit 193ddaa2f6
2 changed files with 10 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
kernel/arch/x86_64/PageTable.cpp
View File

@ -44,6 +44,11 @@ namespace Kernel
return addr;
}
static inline PageTable::flags_t parse_flags(uint64_t entry)
{
return (s_has_nxe && !(entry & (1ull << 63)) ? PageTable::Flags::Execute : 0) | (entry & 0b111);
}
void PageTable::initialize()
{
if (CPUID::has_nxe())
@ -342,8 +347,7 @@ namespace Kernel
PageTable::flags_t PageTable::get_page_flags(vaddr_t addr) const
{
uint64_t page_data = get_page_data(addr);
return (page_data & (1ull << 63) ? Flags::Execute : 0) | (page_data & PAGE_FLAG_MASK);
return parse_flags(get_page_data(addr));
}
paddr_t PageTable::physical_address_of(vaddr_t addr) const
@ -463,9 +467,10 @@ namespace Kernel
{
if (start == 0)
return;
dprintln("{}-{}: {}{}{}",
dprintln("{}-{}: {}{}{}{}",
(void*)canonicalize(start),
(void*)canonicalize(end - 1),
flags & PageTable::Flags::Execute ? 'x' : '-',
flags & PageTable::Flags::UserSupervisor ? 'u' : '-',
flags & PageTable::Flags::ReadWrite ? 'w' : '-',
flags & PageTable::Flags::Present ? 'r' : '-'
@ -509,7 +514,7 @@ namespace Kernel
uint64_t* pt = (uint64_t*)P2V(pd[pde] & PAGE_ADDR_MASK);
for (uint64_t pte = 0; pte < 512; pte++)
{
if ((pt[pte] & PAGE_FLAG_MASK) != flags)
if (parse_flags(pt[pte]) != flags)
{
dump_range(start, (pml4e << 39) | (pdpte << 30) | (pde << 21) | (pte << 12), flags);
start = 0;
@ -520,7 +525,7 @@ namespace Kernel
if (start == 0)
{
flags = pt[pte] & PAGE_FLAG_MASK;
flags = parse_flags(pt[pte]);
start = (pml4e << 39) | (pdpte << 30) | (pde << 21) | (pte << 12);
}
}

1
kernel/include/kernel/Memory/Types.h
View File

@ -11,7 +11,6 @@
#endif
#define PAGE_SIZE ((uintptr_t)4096)
#define PAGE_FLAG_MASK ((uintptr_t)0xF)
#define PAGE_ADDR_MASK (~(uintptr_t)0xFFF)
namespace Kernel