From 31b972307a2d67cf14f6f3f03456255e653fb87a Mon Sep 17 00:00:00 2001 From: "Michael D. Lowis" Date: Wed, 8 Feb 2023 22:56:34 -0500 Subject: [PATCH] started working on bare-metal onward implementation --- core/font.c | 261 --------------------------------------------- core/kernel.h | 27 ----- core/main.c | 12 --- core/term.c | 263 ---------------------------------------------- core/video.c | 2 - uefi/crt_x86_64.c | 177 ++++++++++--------------------- uefi/onward.S | 253 ++++++++++++++++++++++++++++++++++++++++++++ uefi/platform.h | 60 +---------- 8 files changed, 310 insertions(+), 745 deletions(-) delete mode 100644 core/font.c delete mode 100644 core/kernel.h delete mode 100644 core/main.c delete mode 100644 core/term.c delete mode 100644 core/video.c create mode 100644 uefi/onward.S diff --git a/core/font.c b/core/font.c deleted file mode 100644 index 84fbb4c..0000000 --- a/core/font.c +++ /dev/null @@ -1,261 +0,0 @@ -#include -#include - -uint8_t Font[4096] = { - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x7e, 0x81, 0xa5, 0x81, 0x81, 0xbd, 0x99, 0x81, 0x81, 0x7e, 0x00, 0x00, 0x00, 0x00, - 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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 -}; diff --git a/core/kernel.h b/core/kernel.h deleted file mode 100644 index 4e35be5..0000000 --- a/core/kernel.h +++ /dev/null @@ -1,27 +0,0 @@ -/* - Graphics Support -*/ -#define FONT_WIDTH 8 -#define FONT_HEIGHT 16 -extern uint8_t Font[]; - -static inline void Video_PutPixel(int x, int y, uint32_t pixel) -{ - Video.buffer[Video.stride * y + x] = pixel; -} - -/* - Terminal/Console Driver -*/ -void Term_Init(void); -void Term_Clear(void); -void Term_Print(char*, ...); -void Term_PutChar(int c); -void Term_PutString(char* s); -void Term_PutInt(int64_t val); -void Term_PutHex(uint64_t val); -void Term_PutHex8(uint8_t val); -void Term_PutHex16(uint16_t val); -void Term_PutHex32(uint32_t val); -void Term_PutHex64(uint64_t val); -void Term_PutNewline(void); \ No newline at end of file diff --git a/core/main.c b/core/main.c deleted file mode 100644 index 935e029..0000000 --- a/core/main.c +++ /dev/null @@ -1,12 +0,0 @@ -#include -#include -#include - -int main (int argc, char** argv) -{ - Term_Init(); - Term_Print("Done\n"); - sleep(60000); - - return 0; -} diff --git a/core/term.c b/core/term.c deleted file mode 100644 index ef90847..0000000 --- a/core/term.c +++ /dev/null @@ -1,263 +0,0 @@ -#include -#include - -#define MAX_COLS 240 -#define MAX_ROWS 75 - -static char* Digits = "0123456789abcdef"; - -struct { - int cols; - int rows; - int cursor; - char cells[MAX_ROWS * MAX_COLS]; -} Term = { 0 }; - -static void PutGlyph(int x, int y, char c) -{ - char* glyph = &Font[c * FONT_HEIGHT]; - for (int row = 0; row < 16; row++) - { - char piece = glyph[row]; - for (int col = 0; col < 8; col++, piece <<= 1) - { - Video_PutPixel( - x + col, - y + row, - (piece & 0x80) ? 0xFFFFFFFF : 0x00000000); - } - } -} - -static void PutCell(int c) -{ - int max = Term.rows * Term.cols; - /* check if we need to scroll and do it */ - if (Term.cursor >= max) - { - int dst = 0; - int src = Term.cols; - Term.cursor = (Term.rows - 1) * Term.cols; - while (src < max) - { - PutGlyph((dst % Term.cols) * 8, (dst / Term.cols) * 16, Term.cells[src]); - Term.cells[dst++] = Term.cells[src++]; - } - for (int i = Term.cursor; i < (Term.cursor + Term.cols); i++) - { - PutGlyph((i % Term.cols) * 8, (i / Term.cols) * 16, ' '); - Term.cells[i] = ' '; - } - } - /* now place the new glyph */ - Term.cells[Term.cursor] = c; - int row = (Term.cursor / Term.cols); - int col = (Term.cursor % Term.cols); - PutGlyph(col * 8, row * 16, c); - Term.cursor++; -} - -void Term_Init(void) -{ - Term.cols = min(Video.width / FONT_WIDTH, MAX_COLS); - Term.rows = min(Video.height / FONT_HEIGHT, MAX_ROWS); -} - -void Term_PutChar(int c) -{ - switch (c) - { - case '\r': - Term.cursor = (Term.cursor / Term.cols) * Term.cols; - break; - - case '\n': - { - int next = (Term.cursor / Term.cols) * Term.cols + Term.cols; - while (Term.cursor < next) - { - PutCell(' '); - } - break; - } - - default: - PutCell(c); - break; - } -} - -void Term_Print(char* fmt, ...) -{ - va_list arg; - va_start (arg, fmt); - for (; *fmt; fmt++) - { - if (*fmt == '%') - { - int ndigits = sizeof(intptr_t); - fmt++; - if (*fmt >= '0' && *fmt <= '9') - { - ndigits = *(fmt++) - '0'; - } - switch(*fmt) - { - case 'd': - Term_PutInt(va_arg(arg, int)); - break; - - case 'u': - Term_PutInt(va_arg(arg, unsigned int)); - break; - -// case 'f': -// TODO -// break; - - case 'c': - Term_PutChar((char)va_arg(arg, int)); - break; - - case 's': - for (char* s = va_arg(arg, char*); *s; s++) - { - Term_PutChar(*s); - } - break; - - case 'p': - case 'x': - { - uint64_t val = va_arg(arg, uint64_t); - if (ndigits > 6u) - { - Term_PutHex64(val); - } - else if (ndigits > 4u) - { - Term_PutHex32(val); - } - else if (ndigits > 2u) - { - Term_PutHex16(val); - } - else - { - Term_PutHex8(val); - } - break; - } - - case '%': - Term_PutChar('%'); - break; - } - } - else - { - Term_PutChar(*fmt); - } - } - va_end (arg); -} - -void Term_PutString(char* s) -{ - for (; *s; s++) - { - Term_PutChar(*s); - } -} - -static void PutDigits(uint64_t val, uintptr_t base) -{ - char buf[64] = {0}; - int i = 62; - - do - { - buf[i--] = Digits[val % base]; - val /= base; - } while (val && i); - - Term_PutString(&buf[i+1]); -} - -void Term_PutInt(int64_t val) -{ - if (val < 0) - { - Term_PutChar('-'); - val = -val; - } - PutDigits((uintptr_t)val, 10); -} - -void Term_PutHex(uintptr_t val) -{ - PutDigits(val, 16); -} - -void Term_PutHex8(uint8_t val) -{ - Term_PutString((char[]){ - Digits[(val >> 4) & 0xF], - Digits[val & 0xF], - 0 - }); -} - -void Term_PutHex16(uint16_t val) -{ - Term_PutString((char[]){ - Digits[(val >> 12) & 0xF], - Digits[(val >> 8) & 0xF], - Digits[(val >> 4) & 0xF], - Digits[val & 0xF], - 0 - }); -} - -void Term_PutHex32(uint32_t val) -{ - Term_PutString((char[]){ - Digits[(val >> 28) & 0xF], - Digits[(val >> 24) & 0xF], - Digits[(val >> 20) & 0xF], - Digits[(val >> 16) & 0xF], - Digits[(val >> 12) & 0xF], - Digits[(val >> 8) & 0xF], - Digits[(val >> 4) & 0xF], - Digits[val & 0xF], - 0 - }); -} - -void Term_PutHex64(uint64_t val) -{ - Term_PutString((char[]){ - Digits[(val >> 60) & 0xF], - Digits[(val >> 56) & 0xF], - Digits[(val >> 52) & 0xF], - Digits[(val >> 48) & 0xF], - Digits[(val >> 44) & 0xF], - Digits[(val >> 40) & 0xF], - Digits[(val >> 36) & 0xF], - Digits[(val >> 32) & 0xF], - Digits[(val >> 28) & 0xF], - Digits[(val >> 24) & 0xF], - Digits[(val >> 20) & 0xF], - Digits[(val >> 16) & 0xF], - Digits[(val >> 12) & 0xF], - Digits[(val >> 8) & 0xF], - Digits[(val >> 4) & 0xF], - Digits[val & 0xF], - 0 - }); -} - -void Term_PutNewline(void) -{ - Term_PutChar('\n'); -} diff --git a/core/video.c b/core/video.c deleted file mode 100644 index 581f5ac..0000000 --- a/core/video.c +++ /dev/null @@ -1,2 +0,0 @@ -#include - diff --git a/uefi/crt_x86_64.c b/uefi/crt_x86_64.c index 188a800..b61737d 100644 --- a/uefi/crt_x86_64.c +++ b/uefi/crt_x86_64.c @@ -1,87 +1,34 @@ -#include +#include #include -/* this is implemented by the application */ -extern int main(void); - -/* globals to store system table pointers */ -static efi_handle_t IM = NULL; -static efi_system_table_t *ST = NULL; -static efi_boot_services_t *BS = NULL; -static efi_runtime_services_t *RT = NULL; -static efi_loaded_image_protocol_t *LIP = NULL; - -/* platform specific globals */ -VideoConfig Video; -MemoryMap Map; - -//#define D(base, flags, access, base, limit) \ -// (((base >> 24) << 56) | \ -// (flags << 52) | \ -// (limit << 48) | \ -// (access << 40) | \ -// (base << 16) | \ -// (limit)) - -uint64_t GDT[] = { - 0u -}; - -void sleep(int ms) -{ - BS->Stall(ms * 1000); -} +void StartOnward(void); -static void video_init(void) -{ - /* get a handle to the graphics protocol */ - efi_gop_t *gop = NULL; - efi_guid_t gopGuid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; - BS->LocateProtocol(&gopGuid, NULL, (void**)&gop); - - /* query mode 0 to see if mode needs to be set first */ - uintn_t info_size = 0; - efi_gop_mode_info_t *info = NULL; - uintn_t status = gop->QueryMode(gop, 0, &info_size, &info); - - /* some machines need mode set explicitly first */ - if (status == EFI_NOT_STARTED) - { - status = gop->SetMode(gop, 0); - } +struct { + efi_handle_t IM; + efi_system_table_t* ST; + efi_boot_services_t* BS; +} EFI = {0}; - /* - OK, now we have real info for possible modes, pick the max mode. - We assume this one is the best resolution. - */ - if (status == EFI_SUCCESS) - { - status = gop->SetMode(gop, 17); /* pick a smaller resolution for QEMU */ -// status = gop->SetMode(gop, gop->Mode->MaxMode-1); - } - /* - Now let's save off the info we need to draw pixels and glyphs. - The code in this file assumes 32 bits per pixel. - */ - Video.buffer = (uint32_t*)(gop->Mode->FrameBufferBase); - Video.stride = gop->Mode->Information->PixelsPerScanLine; - Video.width = gop->Mode->Information->HorizontalResolution; - Video.height = gop->Mode->Information->VerticalResolution; +long GetChar(void) +{ + efi_input_key_t key = {0}; + efi_status_t status; + do { + status = EFI.ST->ConIn->ReadKeyStroke(EFI.ST->ConIn, &key); + } while(status != EFI_SUCCESS); + return key.UnicodeChar; } -static void memory_init(void) +void PutChar(long c) { - efi_status_t status = 0; - - /* get the map size */ - status = BS->GetMemoryMap( - &Map.size, (efi_memory_descriptor_t*)Map.data, &Map.key, &Map.desc_size, &Map.desc_ver); - /* get the map for real now */ - (void)BS->AllocatePool( - EfiBootServicesData, Map.size + 2 * Map.desc_size, (void**)&Map.data); - status = BS->GetMemoryMap( - &Map.size, (efi_memory_descriptor_t*)Map.data, &Map.key, &Map.desc_size, &Map.desc_ver); + wchar_t data[3] = {c,0,0}; + if (c == '\n' || c == '\r') + { + data[0] = '\r'; + data[1] = '\n'; + } + EFI.ST->ConOut->OutputString(EFI.ST->ConOut, data); } /* @@ -115,44 +62,36 @@ static void memory_init(void) */ /* definitions for elf relocations */ -typedef uint64_t Elf64_Xword; -typedef int64_t Elf64_Sxword; -typedef uint64_t Elf64_Addr; typedef struct { - Elf64_Sxword d_tag; /* Dynamic entry type */ - union - { - Elf64_Xword d_val; /* Integer value */ - Elf64_Addr d_ptr; /* Address value */ - } d_un; + int64_t tag; /* Dynamic entry type */ + uint64_t value; /* Integer or Address value */ } Elf64_Dyn; -#define DT_NULL 0 /* Marks end of dynamic section */ -#define DT_RELA 7 /* Address of Rela relocs */ -#define DT_RELASZ 8 /* Total size of Rela relocs */ -#define DT_RELAENT 9 /* Size of one Rela reloc */ +#define DT_NULL 0 /* Marks end of dynamic section */ +#define DT_RELA 7 /* Address of Rela relocs */ +#define DT_RELASZ 8 /* Total size of Rela relocs */ +#define DT_RELAENT 9 /* Size of one Rela reloc */ typedef struct { - Elf64_Addr r_offset; /* Address */ - Elf64_Xword r_info; /* Relocation type and symbol index */ + uint64_t r_offset; /* Address */ + uint64_t r_info; /* Relocation type and symbol index */ } Elf64_Rel; -#define ELF64_R_TYPE(i) ((i) & 0xffffffff) -#define R_X86_64_RELATIVE 8 /* Adjust by program base */ +#define ELF64_R_TYPE(i) ((i) & 0xffffffff) +#define R_X86_64_RELATIVE 8 /* Adjust by program base */ int uefi_init(uintptr_t ldbase, Elf64_Dyn *dyn, efi_system_table_t *systab, efi_handle_t image) { - efi_guid_t lipGuid = EFI_LOADED_IMAGE_PROTOCOL_GUID; efi_status_t status; - long relsz = 0, relent = 0; Elf64_Rel *rel = 0; uintptr_t *addr; + /* handle relocations */ - for (int i = 0; dyn[i].d_tag != DT_NULL; ++i) { - switch (dyn[i].d_tag) { - case DT_RELA: rel = (Elf64_Rel*)((unsigned long)dyn[i].d_un.d_ptr + ldbase); break; - case DT_RELASZ: relsz = dyn[i].d_un.d_val; break; - case DT_RELAENT: relent = dyn[i].d_un.d_val; break; + for (int i = 0; dyn[i].tag != DT_NULL; ++i) { + switch (dyn[i].tag) { + case DT_RELA: rel = (Elf64_Rel*)((unsigned long)dyn[i].value + ldbase); break; + case DT_RELASZ: relsz = dyn[i].value; break; + case DT_RELAENT: relent = dyn[i].value; break; default: break; } } @@ -176,29 +115,21 @@ int uefi_init(uintptr_t ldbase, Elf64_Dyn *dyn, efi_system_table_t *systab, efi_ ); /* save EFI pointers and loaded image into globals */ - IM = image; - ST = systab; - BS = systab->BootServices; - RT = systab->RuntimeServices; - BS->HandleProtocol(image, &lipGuid, (void **)&LIP); - - /* perform some initialization for the kernel */ - video_init(); - memory_init(); - - /* exit boot services now */ - status = BS->ExitBootServices(IM, Map.key); - - /* initialize the TSS */ - /* initialize the IDT */ - /* initialize the paging tables */ - /* initialize the heap allocator */ - /* initialize system calls */ - /* initialize the realtime clock */ - /* initialize the global timer */ - - /* now jump to kernel main() */ - return main(); + EFI.IM = image; + EFI.ST = systab; + EFI.BS = systab->BootServices; + + /* start the REPL */ + EFI.ST->ConOut->ClearScreen(EFI.ST->ConOut); + EFI.ST->ConOut->EnableCursor(EFI.ST->ConOut, 1); + StartOnward(); + +// while(1) +// { +// PutChar(GetChar()); +// } + + return 0; } /* we only need one .o file, so use inline Assembly here */ diff --git a/uefi/onward.S b/uefi/onward.S new file mode 100644 index 0000000..0fde90e --- /dev/null +++ b/uefi/onward.S @@ -0,0 +1,253 @@ +//--------------------------------------------------------------------- +// TODO +//--------------------------------------------------------------------- +/* +*/ + +//--------------------------------------------------------------------- +// Register Usage +//--------------------------------------------------------------------- +// x86_64 Parameter Registers: +// rdi, rsi, rdx, rcx, r8, r9 +// +// x86_64 Preserved Registers: +// rbx, rsp, rbp, r12, r13, r14, r15 + +.set PC, %rsi /* Program Counter */ +.set ASP, %rsp /* Argument Stack Pointer*/ +.set RSP, %rbp /* Return Stack Pointer */ +.set OA1, %rax /* Operator Argument Register 1 */ +.set OA2, %rbx /* Operator Argument Register 2 */ + +//--------------------------------------------------------------------- +// Assembler Macros +//--------------------------------------------------------------------- + +// Execute next instruction +.macro NEXT + lodsq + jmpq *(OA1) +.endm + +.macro PUSHRSP reg + leaq -8(%rbp),%rbp // push reg on to return stack + movq \reg,(%rbp) +.endm + +.macro POPRSP reg + movq (%rbp),\reg // pop top of return stack to reg + leaq 8(%rbp),%rbp +.endm + +.macro defcode name, namelen, flags=0, label + .data + .p2align 4 + .global name_\label +name_\label : + .quad link + .set link, name_\label + .byte \flags+\namelen + .ascii "\name" + .p2align 4 + .global \label +\label : + .quad code_\label + .text + .p2align 4, 0x90 + .global code_\label +code_\label : +.endm + +.macro defword name, namelen, flags=0, label + .data + .p2align 4 + .global name_\label +name_\label : + .quad link + .set link,name_\label + .byte \flags+\namelen + .ascii "\name" + .p2align 4 + .globl \label +\label : + .int DOCOL +.endm + +//--------------------------------------------------------------------- +// Inner Interpreter Word +//--------------------------------------------------------------------- + +// Main Interpreter Definition + .text + .globl DOCOL + .p2align 4, 0x90 +DOCOL: + pushq PC + leaq 8(OA1), PC + NEXT + +//--------------------------------------------------------------------- +// Builtin Primitives +//--------------------------------------------------------------------- +// Legend: +// i Integer value +// f Fixed point value +// F Floating point value +// s String value +// v Any value + +// (i - ) Exit the application with status code +defcode "halt",4,,halt + popq %rdi + call _exit + +// ( - v) Pushes an immediate value onto the stack +defcode "lit",3,,lit + lodsq + pushq OA1 + NEXT + +// (v - )Duplicates the top value on the stack +defcode "drop",4,,drop + popq OA1 + NEXT + +// (v1 v2 - v2 v1) Swap the top two values on the stack +defcode "swap",4,,swap + popq OA1 + popq OA2 + pushq OA2 + pushq OA1 + NEXT + +// (v - v v) Duplicate the top value on the stack +defcode "dup",3,,dup + movq (ASP), OA1 + pushq OA1 + NEXT + +// (v1 v2 - v1 v2 v1) Duplicate second item on the stack +defcode "over",4,,over + movq 8(ASP), OA1 + pushq OA1 + NEXT + +// defcode rot +// defcode -rot +// defcode 2drop +// defcode 2dup +// defcode 2swap +// defcode ?dup + +// defcode 1+ +// defcode 1- +// defcode 4+ +// defcode 4- +// defcode 8+ +// defcode 8- + +// defcode + +// defcode - +// defcode * +// defcode / +// defcode % + +// defcode = +// defcode != +// defcode < +// defcode > +// defcode <= +// defcode >= + +// defcode 0= +// defcode 0!= +// defcode 0< +// defcode 0> +// defcode 0<= +// defcode 0>= + +// defcode and +// defcode or +// defcode xor +// defcode not + + +// defcode ret + + +// defcode ! +// defcode @ +// defcode +! +// defcode -! +// defcode b! +// defcode b@ +// defcode b@b! +// defcode bmove + + +// defcode >r +// defcode r> +// defcode rsp@ +// defcode rsp! +// defcode rdrop + +// defcode asp@ +// defcode asp! + +// defcode getc +// defcode putc +// defcode word +// defcode number +// defcode find +// defcode >cfa +// defcode >dfa +// defcode create +// defcode , +// defcode [ +// defcode ] +// defcode : +// defcode ; +// defcode immediate +// defcode hidden +// defcode hide +// defcode ' + +// defcode branch +// defcode 0branch +// defcode litstring +// defcode tell +// defcode quit +// defcode interpret + +// defcode char +// defcode execute +// defcode syscall // or EFI call + +// Floating point operations +// defcode +. +// defcode -. +// defcode *. +// defcode /. + +//--------------------------------------------------------------------- +// Main Routine +//--------------------------------------------------------------------- + .text + .global StartOnward + .p2align 4, 0x90 +StartOnward: + pushq OA1 + pushq %rbp + leaq cold_start(%rip), PC + NEXT + +// First instructions to execute by the interpreter + .data + .global cold_start + .p2align 4 +cold_start: + .quad lit, 42 + .quad lit, 24 + .quad over + .quad halt +// .quad QUIT diff --git a/uefi/platform.h b/uefi/platform.h index b4b599b..9e7eb2d 100644 --- a/uefi/platform.h +++ b/uefi/platform.h @@ -1,57 +1,3 @@ -/* define standard type definitions */ -typedef char int8_t; -typedef unsigned char uint8_t; -typedef short int16_t; -typedef unsigned short uint16_t; -typedef int int32_t; -typedef unsigned int uint32_t; -typedef long long int64_t; -typedef unsigned long long uint64_t; -typedef long long intptr_t; -typedef unsigned long long uintptr_t; - -/* sanity check type definitions */ -extern char check_u16[sizeof(uint16_t) == 2 ? 1 : -1]; -extern char check_u32[sizeof(uint32_t) == 4 ? 1 : -1]; -extern char check_u64[sizeof(uint64_t) == 8 ? 1 : -1]; -extern char check_uptr[sizeof(uintptr_t) == 8 ? 1 : -1]; - -#define NULL ((void*)0) -#define abs(x) ((x)<0?-(x):(x)) -#define min(x,y) ((x)<(y)?(x):(y)) -#define max(x,y) ((x)>(y)?(x):(y)) - -typedef __builtin_va_list va_list; -#define va_start(v,l) __builtin_va_start(v,l) -#define va_end(v) __builtin_va_end(v) -#define va_arg(v,l) __builtin_va_arg(v,l) - -/* video memory configuration info */ -typedef struct { - uint32_t* buffer; - uint32_t stride; - uint32_t width; - uint32_t height; -} VideoConfig; - -typedef struct { - uint32_t type; - uint32_t pad; - uint64_t phys_start; - uint64_t virt_start; - uint64_t npages; - uint64_t attr; -} MemoryDescriptor; - -typedef struct { - MemoryDescriptor* data; - uint64_t size; - uint64_t key; - uint64_t desc_size; - uint32_t desc_ver; -} MemoryMap; - -extern MemoryMap Map; -extern VideoConfig Video; - -void sleep(int ms); +void sleep(long ms); +long getchar(void); +void putchar(long c); -- 2.52.0