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Kernel: kmalloc has now somewhat dynamic storage

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Allocations bigger than PAGE_SIZE and those not forced to be identity
mapped are now done on a GeneralAllocator. This allows us to use kmalloc
for big allocations; bigger than the fixed 1 MiB storage.

This is still a hack and the whole kmalloc will have to be rewritten at
some point, but for now this does the job :D
This commit is contained in:
Bananymous
2023-06-18 23:27:00 +03:00
parent 388f530edd
commit 5e123031aa
5 changed files with 69 additions and 10 deletions
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15
kernel/arch/x86_64/IDT.cpp
View File

@@ -137,6 +137,21 @@ namespace IDT
extern "C" void cpp_isr_handler(uint64_t isr, uint64_t error, const Registers* regs)
{
if (isr == ISR::PageFault)
{
using namespace Kernel;
vaddr_t vaddr = regs->cr2 & PAGE_ADDR_MASK;
if (!PageTable::kernel().is_page_free(vaddr))
{
auto paddr = kmalloc_paddr_of(vaddr);
ASSERT(paddr.has_value());
PageTable::current().map_page_at(paddr.value(), vaddr, PageTable::Flags::ReadWrite | PageTable::Flags::Present);
return;
}
}
pid_t tid = Kernel::Scheduler::current_tid();
pid_t pid = tid ? Kernel::Process::current().pid() : 0;

2
kernel/arch/x86_64/PageTable.cpp
View File

@@ -65,7 +65,7 @@ namespace Kernel
static uint64_t* allocate_page_aligned_page()
{
void* page = kmalloc(PAGE_SIZE, PAGE_SIZE);
void* page = kmalloc(PAGE_SIZE, PAGE_SIZE, true);
ASSERT(page);
memset(page, 0, PAGE_SIZE);
return (uint64_t*)page;