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Refactor the kernel files for the new terminal implementation

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Jan-Pieter Baert 2020-01-28 02:16:53 +01:00
parent dea250ee13
commit f9dcb7a5b7
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GPG key ID: B19186932178234A
3 changed files with 130 additions and 114 deletions
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105
kernel/exception.c
View file

@ -21,60 +21,65 @@ __attribute__((interrupt)) void NAME (interrupt_frame* frame, uint32_t err_code)
bsod(frame, STR, err_code); \ bsod(frame, STR, err_code); \
} }
terminal_state state;
void exception_set_terminal_state(terminal_state* s){
terminal_state_copy(s,&state);
}
void bsod(interrupt_frame* frame, char* err_msg, int32_t err_code) { void bsod(interrupt_frame* frame, char* err_msg, int32_t err_code) {
terminal_initialize(); terminal_write_str(&state,"An exception occured: ");
terminal_writestring("An exception occured: "); terminal_write_str(&state,err_msg);
terminal_writestring(err_msg);
if(err_code != -1) { if(err_code != -1) {
terminal_writestring(" (error code = 0x"); terminal_write_str(&state," (error code = 0x");
terminal_writeint(err_code, 16); terminal_write_int(&state,err_code, 16);
terminal_writestring(")"); terminal_write_str(&state,")");
} }
terminal_writestring("\nHere's what we know:\n"); terminal_write_str(&state,"\nHere's what we know:\n");
terminal_writestring("eip = 0x"); terminal_write_str(&state,"eip = 0x");
terminal_writeint(frame->eip, 16); terminal_write_int(&state,frame->eip, 16);
terminal_writestring("\ncs = 0x"); terminal_write_str(&state,"\ncs = 0x");
terminal_writeint(frame->cs, 16); terminal_write_int(&state,frame->cs, 16);
terminal_writestring("\neflags = 0b"); terminal_write_str(&state,"\neflags = 0b");
terminal_writeint(frame->eflags, 2); terminal_write_int(&state,frame->eflags, 2);
terminal_writestring("\n("); terminal_write_str(&state,"\n(");
terminal_writestring((0x0001 & frame->eflags) != 0 ? "NC,": "CY,"); terminal_write_str(&state,(0x0001 & frame->eflags) != 0 ? "NC,": "CY,");
terminal_writestring((0x0004 & frame->eflags) != 0 ? "PE,": "PO,"); terminal_write_str(&state,(0x0004 & frame->eflags) != 0 ? "PE,": "PO,");
terminal_writestring((0x0010 & frame->eflags) != 0 ? "AC,": "NA,"); terminal_write_str(&state,(0x0010 & frame->eflags) != 0 ? "AC,": "NA,");
terminal_writestring((0x0040 & frame->eflags) != 0 ? "ZR,": "NZ,"); terminal_write_str(&state,(0x0040 & frame->eflags) != 0 ? "ZR,": "NZ,");
terminal_writestring((0x0080 & frame->eflags) != 0 ? "NG,": "PL,"); terminal_write_str(&state,(0x0080 & frame->eflags) != 0 ? "NG,": "PL,");
terminal_writestring("TF:"); terminal_write_str(&state,"TF:");
terminal_writeint((0x0100 & frame->eflags) >> 8, 2); terminal_write_int(&state,(0x0100 & frame->eflags) >> 8, 2);
terminal_putchar(','); terminal_write_char(&state,',');
terminal_writestring((0x0200 & frame->eflags) != 0 ? "EI,": "DI,"); terminal_write_str(&state,(0x0200 & frame->eflags) != 0 ? "EI,": "DI,");
terminal_writestring((0x0400 & frame->eflags) != 0 ? "DN,": "UP,"); terminal_write_str(&state,(0x0400 & frame->eflags) != 0 ? "DN,": "UP,");
terminal_writestring((0x0800 & frame->eflags) != 0 ? "OV,": "NV,"); terminal_write_str(&state,(0x0800 & frame->eflags) != 0 ? "OV,": "NV,");
terminal_writestring("IOPL:"); terminal_write_str(&state,"IOPL:");
terminal_writeint((0x3000 & frame->eflags) >> 12, 10); terminal_write_int(&state,(0x3000 & frame->eflags) >> 12, 10);
terminal_putchar(','); terminal_write_char(&state,',');
terminal_writestring("NT:"); terminal_write_str(&state,"NT:");
terminal_writeint((0x4000 & frame->eflags) >> 14, 2); terminal_write_int(&state,(0x4000 & frame->eflags) >> 14, 2);
terminal_putchar(','); terminal_write_char(&state,',');
terminal_writestring("RF:"); terminal_write_str(&state,"RF:");
terminal_writeint((0x0001000 & frame->eflags) >> 16, 2); terminal_write_int(&state,(0x0001000 & frame->eflags) >> 16, 2);
terminal_putchar(','); terminal_write_char(&state,',');
terminal_writestring("VM:"); terminal_write_str(&state,"VM:");
terminal_writeint((0x0002000 & frame->eflags) >> 17, 2); terminal_write_int(&state,(0x0002000 & frame->eflags) >> 17, 2);
terminal_putchar(','); terminal_write_char(&state,',');
terminal_writestring("AC:"); terminal_write_str(&state,"AC:");
terminal_writeint((0x0004000 & frame->eflags) >> 18, 2); terminal_write_int(&state,(0x0004000 & frame->eflags) >> 18, 2);
terminal_putchar(','); terminal_write_char(&state,',');
terminal_writestring("VIF:"); terminal_write_str(&state,"VIF:");
terminal_writeint((0x0008000 & frame->eflags) >> 19, 2); terminal_write_int(&state,(0x0008000 & frame->eflags) >> 19, 2);
terminal_putchar(','); terminal_write_char(&state,',');
terminal_writestring("VIP:"); terminal_write_str(&state,"VIP:");
terminal_writeint((0x0010000 & frame->eflags) >> 20, 2); terminal_write_int(&state,(0x0010000 & frame->eflags) >> 20, 2);
terminal_putchar(','); terminal_write_char(&state,',');
terminal_writestring("ID:"); terminal_write_str(&state,"ID:");
terminal_writeint((0x0020000 & frame->eflags) >> 21, 2); terminal_write_int(&state,(0x0020000 & frame->eflags) >> 21, 2);
terminal_putchar(')'); terminal_write_char(&state,')');
for(;;) { for(;;) {
asm("hlt"); asm("hlt");
@ -104,4 +109,4 @@ EXCEPTION_HANDLER_NO_ERR(simd_fp_exception_handler, "SIMD floating point excepti
EXCEPTION_HANDLER_NO_ERR(virtualization_exception_handler, "Virtualization exception"); EXCEPTION_HANDLER_NO_ERR(virtualization_exception_handler, "Virtualization exception");
EXCEPTION_HANDLER_NO_ERR(security_exception_handler, "Security exception"); EXCEPTION_HANDLER_NO_ERR(security_exception_handler, "Security exception");
#endif //EXCEPTION_C #endif //EXCEPTION_C

43
kernel/kernel.c
View file

@ -25,22 +25,27 @@ static inline bool are_interrupts_enabled() {
return flags & (1 << 9); return flags & (1 << 9);
} }
void kernel_main(void) void kernel_main(void)
{ {
/* Initialize terminal interface */ terminal_state state;
terminal_initialize(); terminal_initialize_state(&state);
terminal_putchar('H'); terminal_set_color(&state, VGA_COLOR_BLACK, VGA_COLOR_RED);
terminal_putchar('e'); terminal_write_char(&state, 'H');
terminal_putchar('l'); terminal_set_color(&state, VGA_COLOR_BLACK, VGA_COLOR_GREEN);
terminal_putchar('l'); terminal_write_char(&state, 'e');
terminal_putchar('o'); terminal_set_color(&state, VGA_COLOR_BLACK, VGA_COLOR_BLUE);
terminal_write_char(&state, 'l');
terminal_setcolor(vga_entry_color(VGA_COLOR_GREEN, VGA_COLOR_BLACK)); terminal_set_color(&state, VGA_COLOR_BLACK, VGA_COLOR_MAGENTA);
terminal_writestring(" kernel"); terminal_write_char(&state, 'l');
terminal_setcolor(vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK)); terminal_set_color(&state, VGA_COLOR_BLACK, VGA_COLOR_WHITE);
terminal_writestring(" World!\n"); terminal_write_char(&state, 'o');
terminal_writestring("Newlines!\n");
terminal_set_color(&state, VGA_COLOR_GREEN, VGA_COLOR_WHITE);
terminal_write_str(&state," kernel");
terminal_set_color(&state, VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
terminal_write_str(&state," World!\n");
terminal_write_str(&state,"Newlines!\n");
char* memory_str = alloc(sizeof(char) * 7); char* memory_str = alloc(sizeof(char) * 7);
for (int i = 0; i < 6; i++) { for (int i = 0; i < 6; i++) {
@ -54,14 +59,16 @@ void kernel_main(void)
} }
management_str[13] = 0; management_str[13] = 0;
terminal_writestring(memory_str); /* terminal_write_str(&state,memory_str); */
terminal_writestring(management_str); /* terminal_write_str(&state,management_str); */
terminal_writestring((are_interrupts_enabled())? "Interrupts!\n": "No interrupts :(\n"); terminal_write_str(&state, (are_interrupts_enabled())? "Interrupts!\n": "No interrupts :(\n");
shell_set_terminal_state(&state);
exception_set_terminal_state(&state);
interrupt_init(); interrupt_init();
for(;;) { for(;;) {
shell_step(); shell_step();
} }
} }

96
kernel/shell.c
View file

@ -11,31 +11,36 @@
char buffer[SHELL_CMD_BUFFER_SIZE]; char buffer[SHELL_CMD_BUFFER_SIZE];
int buffer_idx = 0; int buffer_idx = 0;
terminal_state state;
void shell_set_terminal_state(terminal_state* s){
terminal_state_copy(s,&state);
}
int echo(char* input) { int echo(char* input) {
terminal_writestring(input); terminal_write_str(&state,input);
terminal_putchar('\n'); terminal_write_char(&state,'\n');
return 0; return 0;
} }
int hello(char* unused) { int hello(char* unused) {
terminal_writestring("Hello, world!\n"); terminal_write_str(&state,"Hello, world!\n");
return 0; return 0;
} }
int cls(char* unused) { int cls(char* unused) {
terminal_initialize(); terminal_clear_state(&state);
return 0; return 0;
} }
int get_gdt(char* unused) { int get_gdt(char* unused) {
gdt_desc desc = {2,2}; gdt_desc desc = {2,2};
sgdt(&desc); sgdt(&desc);
terminal_writestring("limit = "); terminal_write_str(&state,"limit = ");
terminal_writeint(desc.limit, 10); terminal_write_int(&state,desc.limit, 10);
terminal_writestring("\nbase = 0x"); terminal_write_str(&state,"\nbase = 0x");
terminal_writeint(desc.base, 16); terminal_write_int(&state,desc.base, 16);
terminal_putchar('\n'); terminal_write_char(&state,'\n');
gdt_entry* entries = (gdt_entry*) desc.base; gdt_entry* entries = (gdt_entry*) desc.base;
int num_entries = (desc.limit+1) / 8; int num_entries = (desc.limit+1) / 8;
@ -46,79 +51,78 @@ int get_gdt(char* unused) {
uint8_t flags = (entry.flags_limit_higher >> 4); uint8_t flags = (entry.flags_limit_higher >> 4);
bool is_data = ((entry.access_byte & 0b00001000) >> 3) == 0; bool is_data = ((entry.access_byte & 0b00001000) >> 3) == 0;
//terminal_writestring("\nEntry "); //terminal_write_str(&state,"\nEntry ");
//terminal_writeint(entry_num, 10); //terminal_write_int(&state,entry_num, 10);
terminal_writestring("base = 0x"); terminal_write_str(&state,"base = 0x");
terminal_writeint(base, 16); terminal_write_int(&state,base, 16);
terminal_writestring("\nlimit = 0x"); terminal_write_str(&state,"\nlimit = 0x");
terminal_writeint(limit, 16); terminal_write_int(&state,limit, 16);
terminal_writestring("\nflags = 0b"); terminal_write_str(&state,"\nflags = 0b");
terminal_writeint((entry.flags_limit_higher >> 4), 2); terminal_write_int(&state,(entry.flags_limit_higher >> 4), 2);
if ((flags & 0b1000) == 0) { if ((flags & 0b1000) == 0) {
terminal_writestring(" (byte granularity"); terminal_write_str(&state," (byte granularity");
} else { } else {
terminal_writestring(" (page granularity"); terminal_write_str(&state," (page granularity");
} }
if ((flags & 0b0100) == 0) { if ((flags & 0b0100) == 0) {
terminal_writestring(", 16 bit)"); terminal_write_str(&state,", 16 bit)");
} else { } else {
terminal_writestring(", 32 bit)"); terminal_write_str(&state,", 32 bit)");
} }
terminal_writestring("\naccess = 0b"); terminal_write_str(&state,"\naccess = 0b");
terminal_writeint(entry.access_byte, 2); terminal_write_int(&state,entry.access_byte, 2);
terminal_writestring(" (ring "); terminal_write_str(&state," (ring ");
terminal_writeint((entry.access_byte & 0b01100000) >> 5, 10); terminal_write_int(&state,(entry.access_byte & 0b01100000) >> 5, 10);
if ((entry.access_byte & 0b00010000) == 0) { if ((entry.access_byte & 0b00010000) == 0) {
terminal_writestring(", System"); terminal_write_str(&state,", System");
} }
if (is_data) { if (is_data) {
terminal_writestring(", Data"); terminal_write_str(&state,", Data");
if((entry.access_byte & 0b00000100) == 0) { if((entry.access_byte & 0b00000100) == 0) {
terminal_writestring(" (growing up, "); terminal_write_str(&state," (growing up, ");
} else { } else {
terminal_writestring(" (growing down, "); terminal_write_str(&state," (growing down, ");
} }
if((entry.access_byte & 0b00000010) == 0) { if((entry.access_byte & 0b00000010) == 0) {
terminal_writestring("r--)"); terminal_write_str(&state,"r--)");
} else { } else {
terminal_writestring("rw-)"); terminal_write_str(&state,"rw-)");
} }
} else { } else {
terminal_writestring(", Code"); terminal_write_str(&state,", Code");
if((entry.access_byte & 0b00000100) == 0) { if((entry.access_byte & 0b00000100) == 0) {
terminal_writestring(" (non-conforming, "); terminal_write_str(&state," (non-conforming, ");
} else { } else {
terminal_writestring(" (conforming, "); terminal_write_str(&state," (conforming, ");
} }
if((entry.access_byte & 0b00000010) == 0) { if((entry.access_byte & 0b00000010) == 0) {
terminal_writestring("--x)"); terminal_write_str(&state,"--x)");
} else { } else {
terminal_writestring("r-x)"); terminal_write_str(&state,"r-x)");
} }
} }
terminal_writestring(")\n"); terminal_write_str(&state,")\n");
} }
return 0; return 0;
} }
int ree(char* unused) { int ree(char* unused) {
terminal_initialize(); terminal_write_char(&state,'R');
terminal_putchar('R');
for (int i = 1; i < VGA_WIDTH * VGA_HEIGHT; i++) { for (int i = 1; i < VGA_WIDTH * VGA_HEIGHT; i++) {
terminal_putchar('e'); terminal_write_char(&state,'e');
} }
return 0; return 0;
} }
// TODO This is ugly, fix this // TODO This is ugly, fix this
const char* shell_commands_strings[] = { const char* shell_commands_strings[] = {
"echo", "echo",
"hello", "hello",
@ -167,7 +171,7 @@ void shell_step() {
char curr_char = getchar(); char curr_char = getchar();
if (curr_char == '\n') { if (curr_char == '\n') {
terminal_putchar(curr_char); terminal_write_char(&state,curr_char);
buffer[buffer_idx] = 0; buffer[buffer_idx] = 0;
int result = run_command(buffer); int result = run_command(buffer);
for (int i = 0; i < SHELL_CMD_BUFFER_SIZE; i++) { for (int i = 0; i < SHELL_CMD_BUFFER_SIZE; i++) {
@ -176,19 +180,19 @@ void shell_step() {
buffer_idx = 0; buffer_idx = 0;
if (result == -1) { if (result == -1) {
terminal_writestring("No such command\n"); terminal_write_str(&state,"No such command\n");
} }
} else if (curr_char == 0x08) { } else if (curr_char == 0x08) {
if (buffer_idx != 0) { if (buffer_idx != 0) {
buffer_idx--; buffer_idx--;
buffer[buffer_idx] = 0; buffer[buffer_idx] = 0;
terminal_putchar(curr_char); terminal_write_char(&state,curr_char);
} }
} else { } else {
buffer[buffer_idx] = curr_char; buffer[buffer_idx] = curr_char;
buffer_idx++; buffer_idx++;
terminal_putchar(curr_char); terminal_write_char(&state,curr_char);
} }
} }
#endif //SHELL_C #endif //SHELL_C