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Now only required number of kernel pages assigned.

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This commit is contained in:
neviyn 2018-05-16 00:42:37 +01:00
parent cea54a8b77
commit 6e481f72aa
2 changed files with 15 additions and 2 deletions
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15
kernel/arch/i386/paging.nim
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@ -9,6 +9,13 @@ type
const
blankPageDirectory: PageDirectoryEntry = 0x00000002
var
kernelMemoryStart{.importc: "_kernel_start"}: uint32
kernelMemoryEnd{.importc: "_kernel_end"}: uint32
proc kernelMemoryStartAddress(): uint32 = cast[uint32](kernelMemoryStart.addr)
proc kernelMemoryEndAddress(): uint32 = cast[uint32](kernelMemoryEnd.addr)
var
pageDirectory: ptr PageDirectory
pageTable0{.exportc, codegenDecl: "$# $# __attribute__((aligned(0x1000)))".}: PageTable
@ -54,7 +61,13 @@ proc init*() =
pageDirectory = cast[ptr PageDirectory](toVirtual(pagingAddress))
for i in 0..767:
pageDirectory[][i] = blankPageDirectory
for i in 0..1023:
var pages: uint = uint(int(kernelMemoryEndAddress() - 0xC0000000'u32) / 0x1000)
serial.write("Pages:")
serial.writeLine(pages)
# Assign VGA memory area to 0xC0000000
pageTable0[0] = createEntry(address = 0xB8000, readWrite = true, present = true)
# Assign kernel memory pages to 0xC0100000+
for i in 256..pages:
pageTable0[i] = createEntry(address = uint32(i) * 0x1000, readWrite = true, present = true)
pageDirectory[][768] = createDirectory(address = toPhysical(cast[uint32](pageTable0.addr)), readWrite = true, present = true)
for i in 769..1023:

2
kernel/arch/i386/tty.nim
View File

@ -8,7 +8,7 @@ type
VGAMemory = ptr array[0..(vgaWidth * vgaHeight - 1), VGADoubleByte]
const
terminalBufferBaseAddress = 0xC00B8000
terminalBufferBaseAddress = 0xC0000000
vgaMem = cast[VGAMemory](terminalBufferBaseAddress)
var