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Preallocated kernel address space for video memory.

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This commit is contained in:
Jonas 'Sortie' Termansen 2012-05-28 00:19:18 +02:00
parent 494636b8eb
commit f390418515
3 changed files with 36 additions and 10 deletions
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2
sortix/include/sortix/kernel/memorymanagement.h
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@ -78,6 +78,8 @@ namespace Sortix
void RegisterInitRDSize(size_t size);
addr_t GetHeapLower();
addr_t GetHeapUpper();
addr_t GetVideoMemory();
size_t GetMaxVideoMemorySize();
}
}

14
sortix/x64/memorymanagement.cpp
View file

@ -165,7 +165,9 @@ namespace Sortix
const size_t KERNEL_STACK_SIZE = 256UL * 1024UL;
const addr_t KERNEL_STACK_END = 0xFFFF800000001000UL;
const addr_t KERNEL_STACK_START = KERNEL_STACK_END + KERNEL_STACK_SIZE;
addr_t INITRD = KERNEL_STACK_START;
const addr_t VIDEO_MEMORY = KERNEL_STACK_START;
const size_t VIDEO_MEMORY_MAX_SIZE = 4UL * 1024UL * 1024UL * 1024UL;
const addr_t INITRD = VIDEO_MEMORY + VIDEO_MEMORY_MAX_SIZE;
size_t initrdsize = 0;
const addr_t HEAPUPPER = 0xFFFFFE8000000000UL;
@ -203,5 +205,15 @@ namespace Sortix
{
return KERNEL_STACK_SIZE;
}
addr_t GetVideoMemory()
{
return VIDEO_MEMORY;
}
size_t GetMaxVideoMemorySize()
{
return VIDEO_MEMORY_MAX_SIZE;
}
}
}

30
sortix/x86/memorymanagement.cpp
View file

@ -44,13 +44,13 @@ namespace Sortix
void InitCPU()
{
PML* const BOOTPML2 = (PML* const) 0x01000UL;
PML* const BOOTPML1 = (PML* const) 0x02000UL;
PML* const FORKPML1 = (PML* const) 0x03000UL;
PML* const IDENPML1 = (PML* const) 0x04000UL;
PML* const BOOTPML2 = (PML* const) 0x11000UL;
PML* const BOOTPML1 = (PML* const) 0x12000UL;
PML* const FORKPML1 = (PML* const) 0x13000UL;
PML* const IDENPML1 = (PML* const) 0x14000UL;
// Initialize the memory structures with zeroes.
Maxsi::Memory::Set((PML* const) 0x01000UL, 0, 0x6000UL);
Maxsi::Memory::Set((PML* const) 0x11000UL, 0, 0x6000UL);
// Identity map the first 4 MiB.
addr_t flags = PML_PRESENT | PML_WRITABLE;
@ -80,8 +80,8 @@ namespace Sortix
// course, we still have no physical page allocator, so that's the
// next step.
PML* const PHYSPML1 = (PML* const) 0x05000UL;
PML* const PHYSPML0 = (PML* const) 0x06000UL;
PML* const PHYSPML1 = (PML* const) 0x15000UL;
PML* const PHYSPML0 = (PML* const) 0x16000UL;
BOOTPML2->entry[1021] = (addr_t) PHYSPML1 | flags;
PHYSPML1->entry[0] = (addr_t) PHYSPML0 | flags;
@ -151,14 +151,16 @@ namespace Sortix
// Switch to the address space from when the world was originally
// created. It should contain the kernel, the whole kernel, and
// nothing but the kernel.
PML* const BOOTPML2 = (PML* const) 0x01000UL;
PML* const BOOTPML2 = (PML* const) 0x11000UL;
SwitchAddressSpace((addr_t) BOOTPML2);
}
const size_t KERNEL_STACK_SIZE = 256UL * 1024UL;
const addr_t KERNEL_STACK_END = 0x80001000UL;
const addr_t KERNEL_STACK_START = KERNEL_STACK_END + KERNEL_STACK_SIZE;
addr_t INITRD = KERNEL_STACK_START;
const addr_t VIDEO_MEMORY = KERNEL_STACK_START;
const size_t VIDEO_MEMORY_MAX_SIZE = 256UL * 1024UL * 1024UL;
const addr_t INITRD = VIDEO_MEMORY + VIDEO_MEMORY_MAX_SIZE;
size_t initrdsize = 0;
const addr_t HEAPUPPER = 0xFF400000UL;
@ -196,5 +198,15 @@ namespace Sortix
{
return KERNEL_STACK_SIZE;
}
addr_t GetVideoMemory()
{
return VIDEO_MEMORY;
}
size_t GetMaxVideoMemorySize()
{
return VIDEO_MEMORY_MAX_SIZE;
}
}
}