在内核项目的字符串中合并换行符时，自定义打印函数的输出无效
Invalid output for a custom print function when incorporating newline characters within a string for a kernel project
我正在开发一个内核程序来处理自定义输入的打印功能 OS。我正在关注 Poncho's 找到的第 2 个 YouTube 视频系列 here，我目前正在观看该系列的视频 4，他开始将数字类型添加为渲染器打印功能的输入。现在，我的代码和他的不完全一样，因为我做了一些修改。
-注意- 这不会直接编译，因为没有 main 函数。 _start 被此处未显示的 bootloader 调用或调用，但是我会将其添加到此问题的底部。
当我在内核中像这样使用 class 的打印功能时：
#include "BasicRenderer.h"
extern "C" void _start(Framebuffer* framebuffer, PSF1_FONT** fonts) {
BasicRenderer = renderer(framebuffer, fonts);
renderer.Print("This is some text");
renderer.Print('\n');
renderer.Print(uint64_t(123456789));
renderer.Print('\n');
renderer.Print(int64_t(-123456789));
return;
}
而我运行内核在emu。我正在显示以下输出：
This is some text
123456789
-123456789
以上是正确的，但是，当我尝试将解析换行符集的能力合并为 \n 或 [=28=] 中的 const char* 作为如下例所示的字符串：
#include "BasicRenderer.h"
extern "C" void _start(Framebuffer* framebuffer, PSF1_FONT** fonts) {
BasicRenderer = renderer(framebuffer, fonts);
renderer.Print("This is some text\n");
renderer.Print(uint64_t(123456789));
renderer.Print('\n');
renderer.Print(int64_t(-123456789));
return;
}
现在显示的输出是：
This is some text
123456789
-123456789
此处，第二行的输出在调用 Print() 后显示的数值前面有一个 space，其字符串中有一个 \n。我不确定是什么导致我的代码出现这种情况。它是否与 while 条件或我如何递增和索引到 BasicRenderer::Print(const char* str) 中的字符串有关？还是来自 BasicRender::PutChar(char c)？还是在 to_string() 函数之一中？
这里是相关的实现代码...
BasicRenderer.cpp
#include "BasicRenderer.h"
void BasicRenderer::Print(const char* str) {
char* chr = (char*)str;
while(*chr != 0) {
if ( (*chr == '\') && ((*chr+1 == 'n') || (*chr+1 == '0')) ) {
PutChar('\n');
chr++;
chr++;
} else {
PutChar(*chr);
cursor_position_.x += 8;
if (cursor_position_.x + 8 > framebuffer_->Width) {
cursor_position_.x = 0;
cursor_position_.y += 16;
}
chr++;
}
}
}
void BasicRenderer::Print(uint64_t val) {
const char* str = to_string(val);
Print(str);
}
void BasicRenderer::Print(int64_t val) {
const char* str = to_string(val);
Print(str);
}
void BasicRenderer::PutChar(char c) {
if (c == '\n' || c == '[=14=]') {
cursor_position_.x = 0;
cursor_position_.y += 16;
} else {
unsigned int* pixPtr = (unsigned int*)framebuffer_->BaseAddress;
char* fontPtr = (char*)selected_font_->glyphBuffer + (c * selected_font_->psf1_Header->charsize);
for (unsigned long y = cursor_position_.y; y < cursor_position_.y + 16; y++) {
for (unsigned long x = cursor_position_.x; x < cursor_position_.x + 8; x++) {
if ((*fontPtr & (0b10000000 >> (x - cursor_position_.x))) > 0) {
*(unsigned int*)(pixPtr + x + (y * framebuffer_->PixelsPerScanLine)) = font_color_;
}
}
fontPtr++;
}
}
}
cstr.cpp
#include "cstr.h"
const char* to_string(uint64_t value) {
static char output_uint_buffer[128];
uint8_t size = 0;
uint64_t sizeTest = value;
while (sizeTest / 10 > 0) {
sizeTest /= 10;
size++;
}
uint8_t idx = 0;
while (value / 10 > 0) {
uint8_t remainder = value % 10;
value /= 10;
output_uint_buffer[size - idx] = remainder + '0';
idx++;
}
uint8_t remainder = value % 10;
output_uint_buffer[size-idx] = remainder + '0';
output_uint_buffer[size + 1] = 0;
return output_uint_buffer;
}
const char* to_string(int64_t value) {
static char output_int_buffer[128];
uint8_t isNegative = 0;
if (value < 0) {
isNegative = 1;
value *= -1;
output_int_buffer[0] = '-';
}
uint8_t size = 0;
uint64_t sizeTest = value;
while (sizeTest / 10 > 0) {
sizeTest /= 10;
size++;
}
uint8_t idx = 0;
while (value / 10 > 0) {
uint8_t remainder = value % 10;
value /= 10;
output_int_buffer[isNegative + size - idx] = remainder + '0';
idx++;
}
uint8_t remainder = value % 10;
output_int_buffer[isNegative + size - idx] = remainder + '0';
output_int_buffer[isNegative + size + 1] = 0;
return output_int_buffer;
}
这是声明的其余部分...
BasicRender.h
#pragma once
#include "cstr.h"
#include "math.h"
#include "framebuffer.h"
#include "SimpleFonts.h"
class BasicRenderer {
public:
BasicRenderer(Framebuffer* framebuffer, PSF1_FONT** fonts) :
framebuffer_{framebuffer},
fonts_{fonts},
cursor_position_({0,0}),
selected_font_{fonts_[0]},
font_color_{0xFFFFFFFF}
{}
void Print(const char* str);
void Print(char c) { PutChar(c); }
void Print(uint64_t val);
void Print(int64_t val);
private:
void PutChar(char c);
Framebuffer* framebuffer_;
Point cursor_position_;
PSF1_FONT** fonts_;
PSF1_FONT* selected_font_;
unsigned int font_color_;
};
cstr.h
#pragma once
#include <stdint.h>
const char* to_string(uint64_t value);
const char* to_string(int64_t value);
math.h
#pragma once
struct Point {
unsigned int x;
unsigned int y;
};
Framebuffer.h
#pragma once
#include <stddef.h>
struct Framebuffer {
void* BaseAddress;
size_t BufferSize;
unsigned int Width;
unsigned int Height;
unsigned int PixelsPerScanLine;
};
SimpleFonts.h
#pragma once
struct PSF1_HEADER {
unsigned char magic[2];
unsigned char mode;
unsigned char charsize;
};
struct PSF1_FONT {
PSF1_HEADER* psf1_Header;
void* glyphBuffer;
};
这里是调用上述 kernel 的 bootloader 应用程序。
main.c
#include <efi.h>
#include <efilib.h>
#include <elf.h>
#define PSF1_MAGIC0 0x36
#define PSF1_MAGIC1 0x04
typedef unsigned long long size_t;
typedef struct {
unsigned char magic[2];
unsigned char mode;
unsigned char charsize;
} PSF1_HEADER;
typedef struct {
PSF1_HEADER* psf1_Header;
void* glyphBuffer;
} PSF1_FONT;
typedef struct {
void* BaseAddress;
size_t BufferSize;
unsigned int Width;
unsigned int Height;
unsigned int PixelsPerScanLine;
} Framebuffer; Framebuffer framebuffer;
Framebuffer* InitializeGOP() {
EFI_GUID gopGuid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
EFI_GRAPHICS_OUTPUT_PROTOCOL* gop;
EFI_STATUS status;
status = uefi_call_wrapper(BS->LocateProtocol, 3, &gopGuid, NULL, (void**)&gop);
if (EFI_ERROR(status)) {
Print(L"Unable to locate GOP\n\r");
return NULL;
} else {
Print(L"GOP located\n\r");
}
framebuffer.BaseAddress = (void*)gop->Mode->FrameBufferBase;
framebuffer.BufferSize = gop->Mode->FrameBufferSize;
framebuffer.Width = gop->Mode->Info->HorizontalResolution;
framebuffer.Height = gop->Mode->Info->VerticalResolution;
framebuffer.PixelsPerScanLine = gop->Mode->Info->PixelsPerScanLine;
return &framebuffer;
}
EFI_FILE* LoadFile(EFI_FILE* Directory, CHAR16* Path, EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE* SystemTable) {
EFI_FILE* LoadedFile;
EFI_LOADED_IMAGE_PROTOCOL* LoadedImage;
SystemTable->BootServices->HandleProtocol(ImageHandle, &gEfiLoadedImageProtocolGuid, (void**)&LoadedImage);
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL* FileSystem;
SystemTable->BootServices->HandleProtocol(LoadedImage->DeviceHandle, &gEfiSimpleFileSystemProtocolGuid, (void**)&FileSystem);
if (Directory == NULL) {
FileSystem->OpenVolume(FileSystem, &Directory);
}
EFI_STATUS s = Directory->Open(Directory, &LoadedFile, Path, EFI_FILE_MODE_READ, EFI_FILE_READ_ONLY);
if (s != EFI_SUCCESS) {
return NULL;
}
return LoadedFile;
}
PSF1_FONT* LoadPSF1Font(EFI_FILE* Directory, CHAR16* Path, EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE* SystemTable) {
EFI_FILE* font = LoadFile(Directory, Path, ImageHandle, SystemTable);
if (font == NULL) return NULL;
PSF1_HEADER* fontHeader;
SystemTable->BootServices->AllocatePool(EfiLoaderData, sizeof(PSF1_HEADER), (void**)&fontHeader);
UINTN size = sizeof(PSF1_HEADER);
font->Read(font, &size, fontHeader);
if (fontHeader->magic[0] != PSF1_MAGIC0 || fontHeader->magic[1] != PSF1_MAGIC1) return NULL;
UINTN glyphBufferSize = fontHeader->charsize * 256;
if (fontHeader->mode == 1) { // 512 glyph mode
glyphBufferSize *= 2;
}
void* glyphBuffer;
font->SetPosition(font, sizeof(PSF1_HEADER));
SystemTable->BootServices->AllocatePool(EfiLoaderData, glyphBufferSize, (void**)&glyphBuffer);
font->Read(font, &glyphBufferSize, glyphBuffer);
PSF1_FONT* finishedFont;
SystemTable->BootServices->AllocatePool(EfiLoaderData, sizeof(PSF1_FONT), (void**)&finishedFont);
finishedFont->psf1_Header = fontHeader;
finishedFont->glyphBuffer = glyphBuffer;
return finishedFont;
}
int memcmp(const void* aptr, const void* bptr, size_t n) {
const unsigned char* a = aptr, *b = bptr;
for (size_t i = 0; i < n; i++) {
if (a[i] < b[i]) return -1;
else if(a[i] > b[i]) return 1;
}
return 0;
}
EFI_STATUS efi_main (EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
InitializeLib(ImageHandle, SystemTable);
Print(L"Hello World!\n\r");
EFI_FILE* Kernel = LoadFile(NULL, L"kernel.elf", ImageHandle, SystemTable);
if ( Kernel == NULL) {
Print(L"Could not load kernel \n\r");
} else {
Print(L"Kernel Loaded Successfully \n\r");
}
Elf64_Ehdr header;
{
UINTN FileInfoSize;
EFI_FILE_INFO* FileInfo;
Kernel->GetInfo(Kernel, &gEfiFileInfoGuid, &FileInfoSize, NULL);
SystemTable->BootServices->AllocatePool(EfiLoaderData, FileInfoSize, (void**)&FileInfo);
Kernel->GetInfo(Kernel, &gEfiFileInfoGuid, &FileInfoSize, (void**)&FileInfo);
UINTN size = sizeof(header);
Kernel->Read(Kernel, &size, &header);
}
if (
memcmp(&header.e_ident[EI_MAG0], ELFMAG, SELFMAG) != 0 ||
header.e_ident[EI_CLASS] != ELFCLASS64 ||
header.e_ident[EI_DATA] != ELFDATA2LSB ||
header.e_type != ET_EXEC ||
header.e_machine != EM_X86_64 ||
header.e_version != EV_CURRENT
) {
Print(L"kernel format is bad\r\n");
} else {
Print(L"kernel header successfully verified\r\n");
}
Elf64_Phdr* phdrs;
{
Kernel->SetPosition(Kernel, header.e_phoff);
UINTN size = header.e_phnum * header.e_phentsize;
SystemTable->BootServices->AllocatePool(EfiLoaderData, size, (void**)&phdrs);
Kernel->Read(Kernel, &size, phdrs);
}
for (
Elf64_Phdr* phdr = phdrs;
(char*)phdr < (char*)phdrs + header.e_phnum * header.e_phentsize;
phdr = (Elf64_Phdr*)((char*)phdr + header.e_phentsize)
) {
switch(phdr->p_type) {
case PT_LOAD: {
int pages = (phdr->p_memsz + 0x1000 - 1) / 0x1000;
Elf64_Addr segment = phdr->p_paddr;
SystemTable->BootServices->AllocatePages(AllocateAddress, EfiLoaderData, pages, &segment);
Kernel->SetPosition(Kernel, phdr->p_offset);
UINTN size = phdr->p_filesz;
Kernel->Read(Kernel, &size, (void*)segment);
break;
}
}
}
Print(L"Kernel Loaded\n\r");
void (*KernelStart)(Framebuffer*, PSF1_FONT**) = ((__attribute__((sysv_abi)) void(*)(Framebuffer*, PSF1_FONT**) ) header.e_entry);
PSF1_FONT* newFont = LoadPSF1Font(NULL, L"zap-light16.psf", ImageHandle, SystemTable);
if (newFont == NULL) {
Print(L"Font is not valid or is not found\n\r");
} else {
Print(L"Font found, char size = %d\n\r", newFont->psf1_Header->charsize);
}
PSF1_FONT* newFontExt = LoadPSF1Font(NULL, L"zap-ext-light16.psf", ImageHandle, SystemTable);
if (newFont == NULL) {
Print(L"Font is not valid or is not found\n\r");
} else {
Print(L"Font found, char size = %d\n\r", newFont->psf1_Header->charsize);
}
PSF1_FONT* fonts[] = {newFont, newFontExt};
Framebuffer* newBuffer = InitializeGOP();
Print(L"Base: 0x%x\n\rSize: 0x%x\n\rWidth: %d\n\rHeight: %d\n\rPixelsPerScanline: %d\n\r",
newBuffer->BaseAddress,
newBuffer->BufferSize,
newBuffer->Width,
newBuffer->Height,
newBuffer->PixelsPerScanLine);
KernelStart(newBuffer, fonts);
return EFI_SUCCESS; // Exit the UEFI application
}
问题出在这里：
if ( (*chr == '\') && ((*chr+1 == 'n') || (*chr+1 == '0')) ) {
PutChar('\n');
chr++;
chr++;
}
...
您不应该解析出 \n，因为这将作为换行符出现在字符串中。你想要的是：
if (*chr == '\n') {
PutChar('\n');
chr++;
}
...
我正在开发一个内核程序来处理自定义输入的打印功能 OS。我正在关注 Poncho's 找到的第 2 个 YouTube 视频系列 here，我目前正在观看该系列的视频 4，他开始将数字类型添加为渲染器打印功能的输入。现在，我的代码和他的不完全一样，因为我做了一些修改。
-注意- 这不会直接编译，因为没有 main 函数。 _start 被此处未显示的 bootloader 调用或调用，但是我会将其添加到此问题的底部。
当我在内核中像这样使用 class 的打印功能时：
#include "BasicRenderer.h"
extern "C" void _start(Framebuffer* framebuffer, PSF1_FONT** fonts) {
BasicRenderer = renderer(framebuffer, fonts);
renderer.Print("This is some text");
renderer.Print('\n');
renderer.Print(uint64_t(123456789));
renderer.Print('\n');
renderer.Print(int64_t(-123456789));
return;
}
而我运行内核在emu。我正在显示以下输出：
This is some text
123456789
-123456789
以上是正确的，但是，当我尝试将解析换行符集的能力合并为 \n 或 [=28=] 中的 const char* 作为如下例所示的字符串：
#include "BasicRenderer.h"
extern "C" void _start(Framebuffer* framebuffer, PSF1_FONT** fonts) {
BasicRenderer = renderer(framebuffer, fonts);
renderer.Print("This is some text\n");
renderer.Print(uint64_t(123456789));
renderer.Print('\n');
renderer.Print(int64_t(-123456789));
return;
}
现在显示的输出是：
This is some text
123456789
-123456789
此处，第二行的输出在调用 Print() 后显示的数值前面有一个 space，其字符串中有一个 \n。我不确定是什么导致我的代码出现这种情况。它是否与 while 条件或我如何递增和索引到 BasicRenderer::Print(const char* str) 中的字符串有关？还是来自 BasicRender::PutChar(char c)？还是在 to_string() 函数之一中？
这里是相关的实现代码...
BasicRenderer.cpp
#include "BasicRenderer.h"
void BasicRenderer::Print(const char* str) {
char* chr = (char*)str;
while(*chr != 0) {
if ( (*chr == '\') && ((*chr+1 == 'n') || (*chr+1 == '0')) ) {
PutChar('\n');
chr++;
chr++;
} else {
PutChar(*chr);
cursor_position_.x += 8;
if (cursor_position_.x + 8 > framebuffer_->Width) {
cursor_position_.x = 0;
cursor_position_.y += 16;
}
chr++;
}
}
}
void BasicRenderer::Print(uint64_t val) {
const char* str = to_string(val);
Print(str);
}
void BasicRenderer::Print(int64_t val) {
const char* str = to_string(val);
Print(str);
}
void BasicRenderer::PutChar(char c) {
if (c == '\n' || c == '[=14=]') {
cursor_position_.x = 0;
cursor_position_.y += 16;
} else {
unsigned int* pixPtr = (unsigned int*)framebuffer_->BaseAddress;
char* fontPtr = (char*)selected_font_->glyphBuffer + (c * selected_font_->psf1_Header->charsize);
for (unsigned long y = cursor_position_.y; y < cursor_position_.y + 16; y++) {
for (unsigned long x = cursor_position_.x; x < cursor_position_.x + 8; x++) {
if ((*fontPtr & (0b10000000 >> (x - cursor_position_.x))) > 0) {
*(unsigned int*)(pixPtr + x + (y * framebuffer_->PixelsPerScanLine)) = font_color_;
}
}
fontPtr++;
}
}
}
cstr.cpp
#include "cstr.h"
const char* to_string(uint64_t value) {
static char output_uint_buffer[128];
uint8_t size = 0;
uint64_t sizeTest = value;
while (sizeTest / 10 > 0) {
sizeTest /= 10;
size++;
}
uint8_t idx = 0;
while (value / 10 > 0) {
uint8_t remainder = value % 10;
value /= 10;
output_uint_buffer[size - idx] = remainder + '0';
idx++;
}
uint8_t remainder = value % 10;
output_uint_buffer[size-idx] = remainder + '0';
output_uint_buffer[size + 1] = 0;
return output_uint_buffer;
}
const char* to_string(int64_t value) {
static char output_int_buffer[128];
uint8_t isNegative = 0;
if (value < 0) {
isNegative = 1;
value *= -1;
output_int_buffer[0] = '-';
}
uint8_t size = 0;
uint64_t sizeTest = value;
while (sizeTest / 10 > 0) {
sizeTest /= 10;
size++;
}
uint8_t idx = 0;
while (value / 10 > 0) {
uint8_t remainder = value % 10;
value /= 10;
output_int_buffer[isNegative + size - idx] = remainder + '0';
idx++;
}
uint8_t remainder = value % 10;
output_int_buffer[isNegative + size - idx] = remainder + '0';
output_int_buffer[isNegative + size + 1] = 0;
return output_int_buffer;
}
这是声明的其余部分...
BasicRender.h
#pragma once
#include "cstr.h"
#include "math.h"
#include "framebuffer.h"
#include "SimpleFonts.h"
class BasicRenderer {
public:
BasicRenderer(Framebuffer* framebuffer, PSF1_FONT** fonts) :
framebuffer_{framebuffer},
fonts_{fonts},
cursor_position_({0,0}),
selected_font_{fonts_[0]},
font_color_{0xFFFFFFFF}
{}
void Print(const char* str);
void Print(char c) { PutChar(c); }
void Print(uint64_t val);
void Print(int64_t val);
private:
void PutChar(char c);
Framebuffer* framebuffer_;
Point cursor_position_;
PSF1_FONT** fonts_;
PSF1_FONT* selected_font_;
unsigned int font_color_;
};
cstr.h
#pragma once
#include <stdint.h>
const char* to_string(uint64_t value);
const char* to_string(int64_t value);
math.h
#pragma once
struct Point {
unsigned int x;
unsigned int y;
};
Framebuffer.h
#pragma once
#include <stddef.h>
struct Framebuffer {
void* BaseAddress;
size_t BufferSize;
unsigned int Width;
unsigned int Height;
unsigned int PixelsPerScanLine;
};
SimpleFonts.h
#pragma once
struct PSF1_HEADER {
unsigned char magic[2];
unsigned char mode;
unsigned char charsize;
};
struct PSF1_FONT {
PSF1_HEADER* psf1_Header;
void* glyphBuffer;
};
这里是调用上述 kernel 的 bootloader 应用程序。
main.c
#include <efi.h>
#include <efilib.h>
#include <elf.h>
#define PSF1_MAGIC0 0x36
#define PSF1_MAGIC1 0x04
typedef unsigned long long size_t;
typedef struct {
unsigned char magic[2];
unsigned char mode;
unsigned char charsize;
} PSF1_HEADER;
typedef struct {
PSF1_HEADER* psf1_Header;
void* glyphBuffer;
} PSF1_FONT;
typedef struct {
void* BaseAddress;
size_t BufferSize;
unsigned int Width;
unsigned int Height;
unsigned int PixelsPerScanLine;
} Framebuffer; Framebuffer framebuffer;
Framebuffer* InitializeGOP() {
EFI_GUID gopGuid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
EFI_GRAPHICS_OUTPUT_PROTOCOL* gop;
EFI_STATUS status;
status = uefi_call_wrapper(BS->LocateProtocol, 3, &gopGuid, NULL, (void**)&gop);
if (EFI_ERROR(status)) {
Print(L"Unable to locate GOP\n\r");
return NULL;
} else {
Print(L"GOP located\n\r");
}
framebuffer.BaseAddress = (void*)gop->Mode->FrameBufferBase;
framebuffer.BufferSize = gop->Mode->FrameBufferSize;
framebuffer.Width = gop->Mode->Info->HorizontalResolution;
framebuffer.Height = gop->Mode->Info->VerticalResolution;
framebuffer.PixelsPerScanLine = gop->Mode->Info->PixelsPerScanLine;
return &framebuffer;
}
EFI_FILE* LoadFile(EFI_FILE* Directory, CHAR16* Path, EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE* SystemTable) {
EFI_FILE* LoadedFile;
EFI_LOADED_IMAGE_PROTOCOL* LoadedImage;
SystemTable->BootServices->HandleProtocol(ImageHandle, &gEfiLoadedImageProtocolGuid, (void**)&LoadedImage);
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL* FileSystem;
SystemTable->BootServices->HandleProtocol(LoadedImage->DeviceHandle, &gEfiSimpleFileSystemProtocolGuid, (void**)&FileSystem);
if (Directory == NULL) {
FileSystem->OpenVolume(FileSystem, &Directory);
}
EFI_STATUS s = Directory->Open(Directory, &LoadedFile, Path, EFI_FILE_MODE_READ, EFI_FILE_READ_ONLY);
if (s != EFI_SUCCESS) {
return NULL;
}
return LoadedFile;
}
PSF1_FONT* LoadPSF1Font(EFI_FILE* Directory, CHAR16* Path, EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE* SystemTable) {
EFI_FILE* font = LoadFile(Directory, Path, ImageHandle, SystemTable);
if (font == NULL) return NULL;
PSF1_HEADER* fontHeader;
SystemTable->BootServices->AllocatePool(EfiLoaderData, sizeof(PSF1_HEADER), (void**)&fontHeader);
UINTN size = sizeof(PSF1_HEADER);
font->Read(font, &size, fontHeader);
if (fontHeader->magic[0] != PSF1_MAGIC0 || fontHeader->magic[1] != PSF1_MAGIC1) return NULL;
UINTN glyphBufferSize = fontHeader->charsize * 256;
if (fontHeader->mode == 1) { // 512 glyph mode
glyphBufferSize *= 2;
}
void* glyphBuffer;
font->SetPosition(font, sizeof(PSF1_HEADER));
SystemTable->BootServices->AllocatePool(EfiLoaderData, glyphBufferSize, (void**)&glyphBuffer);
font->Read(font, &glyphBufferSize, glyphBuffer);
PSF1_FONT* finishedFont;
SystemTable->BootServices->AllocatePool(EfiLoaderData, sizeof(PSF1_FONT), (void**)&finishedFont);
finishedFont->psf1_Header = fontHeader;
finishedFont->glyphBuffer = glyphBuffer;
return finishedFont;
}
int memcmp(const void* aptr, const void* bptr, size_t n) {
const unsigned char* a = aptr, *b = bptr;
for (size_t i = 0; i < n; i++) {
if (a[i] < b[i]) return -1;
else if(a[i] > b[i]) return 1;
}
return 0;
}
EFI_STATUS efi_main (EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
InitializeLib(ImageHandle, SystemTable);
Print(L"Hello World!\n\r");
EFI_FILE* Kernel = LoadFile(NULL, L"kernel.elf", ImageHandle, SystemTable);
if ( Kernel == NULL) {
Print(L"Could not load kernel \n\r");
} else {
Print(L"Kernel Loaded Successfully \n\r");
}
Elf64_Ehdr header;
{
UINTN FileInfoSize;
EFI_FILE_INFO* FileInfo;
Kernel->GetInfo(Kernel, &gEfiFileInfoGuid, &FileInfoSize, NULL);
SystemTable->BootServices->AllocatePool(EfiLoaderData, FileInfoSize, (void**)&FileInfo);
Kernel->GetInfo(Kernel, &gEfiFileInfoGuid, &FileInfoSize, (void**)&FileInfo);
UINTN size = sizeof(header);
Kernel->Read(Kernel, &size, &header);
}
if (
memcmp(&header.e_ident[EI_MAG0], ELFMAG, SELFMAG) != 0 ||
header.e_ident[EI_CLASS] != ELFCLASS64 ||
header.e_ident[EI_DATA] != ELFDATA2LSB ||
header.e_type != ET_EXEC ||
header.e_machine != EM_X86_64 ||
header.e_version != EV_CURRENT
) {
Print(L"kernel format is bad\r\n");
} else {
Print(L"kernel header successfully verified\r\n");
}
Elf64_Phdr* phdrs;
{
Kernel->SetPosition(Kernel, header.e_phoff);
UINTN size = header.e_phnum * header.e_phentsize;
SystemTable->BootServices->AllocatePool(EfiLoaderData, size, (void**)&phdrs);
Kernel->Read(Kernel, &size, phdrs);
}
for (
Elf64_Phdr* phdr = phdrs;
(char*)phdr < (char*)phdrs + header.e_phnum * header.e_phentsize;
phdr = (Elf64_Phdr*)((char*)phdr + header.e_phentsize)
) {
switch(phdr->p_type) {
case PT_LOAD: {
int pages = (phdr->p_memsz + 0x1000 - 1) / 0x1000;
Elf64_Addr segment = phdr->p_paddr;
SystemTable->BootServices->AllocatePages(AllocateAddress, EfiLoaderData, pages, &segment);
Kernel->SetPosition(Kernel, phdr->p_offset);
UINTN size = phdr->p_filesz;
Kernel->Read(Kernel, &size, (void*)segment);
break;
}
}
}
Print(L"Kernel Loaded\n\r");
void (*KernelStart)(Framebuffer*, PSF1_FONT**) = ((__attribute__((sysv_abi)) void(*)(Framebuffer*, PSF1_FONT**) ) header.e_entry);
PSF1_FONT* newFont = LoadPSF1Font(NULL, L"zap-light16.psf", ImageHandle, SystemTable);
if (newFont == NULL) {
Print(L"Font is not valid or is not found\n\r");
} else {
Print(L"Font found, char size = %d\n\r", newFont->psf1_Header->charsize);
}
PSF1_FONT* newFontExt = LoadPSF1Font(NULL, L"zap-ext-light16.psf", ImageHandle, SystemTable);
if (newFont == NULL) {
Print(L"Font is not valid or is not found\n\r");
} else {
Print(L"Font found, char size = %d\n\r", newFont->psf1_Header->charsize);
}
PSF1_FONT* fonts[] = {newFont, newFontExt};
Framebuffer* newBuffer = InitializeGOP();
Print(L"Base: 0x%x\n\rSize: 0x%x\n\rWidth: %d\n\rHeight: %d\n\rPixelsPerScanline: %d\n\r",
newBuffer->BaseAddress,
newBuffer->BufferSize,
newBuffer->Width,
newBuffer->Height,
newBuffer->PixelsPerScanLine);
KernelStart(newBuffer, fonts);
return EFI_SUCCESS; // Exit the UEFI application
}
问题出在这里：
if ( (*chr == '\') && ((*chr+1 == 'n') || (*chr+1 == '0')) ) {
PutChar('\n');
chr++;
chr++;
}
...
您不应该解析出 \n，因为这将作为换行符出现在字符串中。你想要的是：
if (*chr == '\n') {
PutChar('\n');
chr++;
}
...