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Fix paging to completion.

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More debug messages, some things are slightly broken. We can recover.
This commit is contained in:
Curle 2021-03-18 20:33:15 +00:00
parent bd9f994648
commit 98f3786e8b
Signed by: TheCurle
GPG Key ID: 5942F13718443F79
5 changed files with 48 additions and 32 deletions
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1
build.json
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@ -35,6 +35,7 @@
"$root/chroma/system/memory/abstract_allocator.c",
"$root/chroma/system/memory/physmem.c",
"$root/chroma/system/memory/paging.c",
"$root/chroma/system/memory/liballoc.c",
"$root/chroma/system/drivers/keyboard.c",
"$root/chroma/system/drivers/elf.c"
],

2
chroma/inc/kernel/system/memory.h
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@ -110,7 +110,7 @@
#define MMIO_REGION 0xFFFFFFFFF8000000ull // Cannot move!
#define FB_REGION 0xFFFFFFFFFC000000ull // Cannot move!
#define FB_PHYSICAL 0x00000000FD000000ull // Physical location of the Framebuffer
#define FB_PHYSICAL (size_t) bootldr.fb_ptr // 0x00000000FD000000ull - Physical location of the Framebuffer
#define KERNEL_REGION 0xFFFFFFFFFFE00000ull // -2MiB, from bootloader
#define KERNEL_TEXT 0x0000000000002000ull // Offset of symbols from the kernel text

6
chroma/kernel.c
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@ -22,7 +22,9 @@ int Main(void) {
KernelAddressSpace = (address_space_t) {0};
SerialPrintf("\r\n[ boot] Booting Chroma..\r\n");
SerialPrintf("[ boot] Bootloader data structure at 0x%p\r\n", (size_t) &bootldr);
SerialPrintf("[ boot] Kernel loaded at 0x%p, ends at 0x%p, is %d bytes long.\r\n", KernelAddr, KernelEnd, KernelEnd - KernelAddr);
SerialPrintf("[ boot] Framebuffer at 0x%p / 0x%p, is %dx%d, 0x%x bytes long.\r\n", bootldr.fb_ptr, (size_t) &fb, bootldr.fb_width, bootldr.fb_height, bootldr.fb_size);
SerialPrintf("[ boot] Initrd is physically at 0x%p, and is %d bytes long.\r\n", bootldr.initrd_ptr, bootldr.initrd_size);
SerialPrintf("[ boot] Initrd's header is 0x%p\r\n", FIXENDIAN32(*((volatile uint32_t*)(bootldr.initrd_ptr))));
@ -48,6 +50,10 @@ int Main(void) {
InitPaging();
InitPrint();
WriteString("Paging complete. System initialized.");
for(;;) { }

35
chroma/system/memory/paging.c
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@ -34,6 +34,14 @@ void InitPaging() {
.PML4 = PhysAllocateZeroMem(4096)
};
address_space_t BootloaderAddressSpace = (address_space_t) {
.Lock = {0},
.PML4 = (size_t*) ReadControlRegister(3)
};
size_t AddressToFind = (size_t) &fb;
size_t BootldrAddress = 0x8000;
SerialPrintf("[ Mem] Identity mapping the entirety of physical memory\r\n");
for(size_t i = 0; i < MemorySize / PAGE_SIZE; i++) {
@ -43,15 +51,21 @@ void InitPaging() {
// TODO: Map kernel mem
}
SerialPrintf("[ Mem] Mapping 0x%x bytes of bootloader structure, starting at 0x%p\r\n", bootldr.size, BootldrAddress);
for(size_t i = BootldrAddress; i < (BootldrAddress + bootldr.size); i += PAGE_SIZE)
MapVirtualPageNoDirect(&KernelAddressSpace, i, KERNEL_REGION + (i - BootldrAddress), 0x3);
// This allows the code to actually run
SerialPrintf("[ Mem] Mapping kernel\r\n");
for(size_t i = KERNEL_PHYSICAL + KERNEL_TEXT; i < KERNEL_END; i += PAGE_SIZE)
SerialPrintf("[ Mem] Mapping 0x%x bytes of kernel, starting at 0x%p\r\n", KernelEnd - KernelAddr, KERNEL_PHYSICAL + KERNEL_TEXT);
for(size_t i = KERNEL_PHYSICAL + KERNEL_TEXT; i < (KernelEnd - KernelAddr) + KERNEL_PHYSICAL; i += PAGE_SIZE)
MapVirtualPageNoDirect(&KernelAddressSpace, i, (i - KERNEL_PHYSICAL) + KERNEL_REGION, 0x3);
// This allows us to write to the screen
SerialPrintf("[ Mem] Mapping framebuffer\r\n");
for(size_t i = FB_PHYSICAL; i < bootldr.fb_size + FB_PHYSICAL; i += PAGE_SIZE)
MapVirtualPageNoDirect(&KernelAddressSpace, i, (i - FB_PHYSICAL) + FB_REGION, 0x3);
SerialPrintf("[ Mem] Mapping 0x%x bytes of framebuffer, starting at 0x%p\r\n", bootldr.fb_size, FB_PHYSICAL);
for(size_t i = FB_PHYSICAL; i < bootldr.fb_size + FB_PHYSICAL; i += PAGE_SIZE) {
MapVirtualPageNoDirect(&KernelAddressSpace, i, i, 0x3); // FD000000 + (page)
MapVirtualPageNoDirect(&KernelAddressSpace, i, (i - FB_PHYSICAL) + FB_REGION, 0x3); // FFFFFFFFFC000000 + (page)
}
// This allows us to call functions
SerialPrintf("[ Mem] Mapping stack\r\n");
@ -59,16 +73,12 @@ void InitPaging() {
// Make sure everything is sane
SerialPrintf("[ Mem] Diagnostic: Querying existing page tables\r\n");
address_space_t BootloaderAddressSpace = (address_space_t) {
.Lock = {0},
.PML4 = (size_t*) ReadControlRegister(3)
};
size_t AddressToFind = 0xffffffffffffff58;
AddressToFind = (size_t) &(bootldr);
size_t BootloaderAddress = DecodeVirtualAddressNoDirect(&BootloaderAddressSpace, AddressToFind);
size_t KernelDisoveredAddress = DecodeVirtualAddressNoDirect(&KernelAddressSpace, AddressToFind);
SerialPrintf("[ Mem] Diagnostic: Existing pagetables put 0x%p at 0x%p.\r\n", AddressToFind, BootloaderAddress);
SerialPrintf("[ Mem] Diagnostic: Our pagetables put 0x%p at 0x%p.\r\n", AddressToFind, KernelDisoveredAddress);
SerialPrintf("[ Mem] Diagnostic: Existing pagetables put 0x%p at 0x%p + 0x%p.\r\n", AddressToFind, BootloaderAddress, AddressToFind & ~STACK_TOP);
SerialPrintf("[ Mem] Diagnostic: Our pagetables put 0x%p at 0x%p + 0x%p.\r\n", AddressToFind, KernelDisoveredAddress, AddressToFind & ~STACK_TOP);
SerialPrintf("[ Mem] %s\r\n", BootloaderAddress == KernelDisoveredAddress ? "These match. Continuing." : "These do not match. Continuing with caution..");
//if(BootloaderAddress != KernelDisoveredAddress)
@ -77,7 +87,6 @@ void InitPaging() {
SerialPrintf("[ Mem] Attempting to jump into our new pagetables: 0x%p\r\n", (size_t) KernelAddressSpace.PML4);
WriteControlRegister(3, (size_t) KernelAddressSpace.PML4 & STACK_TOP);
SerialPrintf("[ Mem] Worked\r\n");
for(;;) {}
}

2
chroma/video/draw.c
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@ -45,7 +45,7 @@ typedef struct {
uint32_t scrlMode;
} PRINTINFO;
PRINTINFO PrintInfo = {0};
static PRINTINFO PrintInfo = {0};
void InitPrint() {
PrintInfo.charHeight = 8;