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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After I added NXE bit, the flags mask is no longer valid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 c0029a2fa2
commit 5babd7b4f2
2 changed files with 10 additions and 6 deletions
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15
kernel/arch/x86_64/PageTable.cpp
View File

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

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

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