[Zion] Move Kernel Stack Memory constants to separate file.
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@ -9,3 +9,14 @@ const uint64_t kKernelSlabHeapStart = 0xFFFF'FFFF'4000'0000;
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const uint64_t kKernelSlabHeapEnd = 0xFFFF'FFFF'6000'0000;
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const uint64_t kKernelBuddyHeapStart = 0xFFFF'FFFF'6000'0000;
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const uint64_t kKernelBuddyHeapEnd = 0xFFFF'FFFF'8000'0000;
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// Note the kernel code isn't actually this large, we just reserve a lot of
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// address space for it. (256 MiB).
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const uint64_t kKernelCodeStart = 0xFFFF'FFFF'8000'0000;
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const uint64_t kKernelCodeEnd = 0xFFFF'FFFF'9000'0000;
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const uint64_t kKernelStackStart = 0xFFFF'FFFF'9000'0000;
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const uint64_t kKernelStackEnd = 0xFFFF'FFFF'A000'0000;
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const uint64_t kKernelStackSize = 3 * kPageSize;
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const uint64_t kKernelStackOffset = 4 * kPageSize;
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@ -3,14 +3,11 @@
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#include "common/gdt.h"
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#include "debug/debug.h"
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#include "interrupt/interrupt.h"
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#include "memory/constants.h"
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#include "memory/paging_util.h"
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#define KERNEL_STACK_START 0xFFFFFFFF'90000000
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#define KERNEL_STACK_LIMIT 0xFFFFFFFF'9FFFFFFF
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#define KERNEL_STACK_OFFSET 0x4000
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KernelStackManager::KernelStackManager()
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: next_stack_addr_(KERNEL_STACK_START) {}
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: next_stack_addr_(kKernelStackStart) {}
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void KernelStackManager::SetupInterruptStack() {
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SetIst1(AllocateKernelStack());
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@ -18,11 +15,11 @@ void KernelStackManager::SetupInterruptStack() {
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}
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uint64_t KernelStackManager::AllocateKernelStack() {
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next_stack_addr_ += KERNEL_STACK_OFFSET;
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if (next_stack_addr_ >= KERNEL_STACK_LIMIT) {
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panic("No more kernelstack space");
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next_stack_addr_ += kKernelStackOffset;
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if (next_stack_addr_ >= kKernelStackEnd) {
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panic("No more kernel stack space");
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}
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EnsureResident(next_stack_addr_ - 0x3000, 0x3000);
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EnsureResident(next_stack_addr_ - kKernelStackSize, kKernelStackSize);
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return next_stack_addr_ - 8;
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}
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