better mboot

This commit is contained in:
Freya Murphy 2024-01-30 16:46:38 -05:00
parent c9d9f1a9af
commit 9cc8dfcf0e
Signed by: freya
GPG key ID: 744AB800E383AE52
7 changed files with 156 additions and 131 deletions

View file

@ -1,13 +1,5 @@
#pragma once #pragma once
enum acpi_status {
ACPI_SUCCESS = 0,
ACPI_FAILURE = -1,
ACPI_MALFORMED_TABLE = -2,
ACPI_OLD_VERSION = -4,
ACPI_S5_PARSE_ERROR = -5,
};
/** /**
* Loads the ACPI tables * Loads the ACPI tables
* https://en.wikipedia.org/wiki/ACPI * https://en.wikipedia.org/wiki/ACPI

View file

@ -2,6 +2,10 @@
#include <memory.h> #include <memory.h>
#define CMDLINE_MAX 32
struct boot_info { struct boot_info {
struct memory_map *map; struct memory_map *map;
void *acpi_table;
char cmdline[CMDLINE_MAX];
}; };

View file

@ -5,6 +5,7 @@
#include <stddef.h> #include <stddef.h>
#include "bindings.h" #include "bindings.h"
#include "serial.h"
/* global state, idk a better way rn */ /* global state, idk a better way rn */
struct acpi_state state; struct acpi_state state;
@ -21,7 +22,18 @@ struct acpi_header {
uint32_t creator_revision; uint32_t creator_revision;
}; };
// root system descriptor pointer
// ACPI 1.0
struct rsdp {
char signature[8];
uint8_t checksum;
char oemid[6];
uint8_t revision;
uint32_t rsdt_addr;
} __attribute__((packed));
// eXtended system descriptor pointer // eXtended system descriptor pointer
// ACPI 2.0
struct xsdp { struct xsdp {
char signature[8]; char signature[8];
uint8_t checksum; uint8_t checksum;
@ -35,13 +47,21 @@ struct xsdp {
uint8_t reserved[3]; uint8_t reserved[3];
} __attribute__((packed)); } __attribute__((packed));
// root system descriptor table
// ACPI 1.0
struct rsdt {
struct acpi_header h;
uint64_t sdt_pointers[];
};
// eXtended system descriptor table // eXtended system descriptor table
// ACPI 2.0
struct xsdt { struct xsdt {
struct acpi_header h; struct acpi_header h;
uint64_t sdt_pointers[]; uint64_t sdt_pointers[];
}; };
// generic address structure // generic address structure
struct gas { struct gas {
uint8_t address_space; uint8_t address_space;
@ -135,8 +155,10 @@ static bool checksum(uint8_t *data, size_t len) {
} }
static int read_s5_addr(struct acpi_state *state) { static int read_s5_addr(struct acpi_state *state) {
serial_out_str("a");
uintptr_t ptr = state->fadt.dsdt; uintptr_t ptr = state->fadt.dsdt;
char *s5_addr = (void*) (ptr + 36); char *s5_addr = (void*) (ptr + 36);
serial_out_str("a");
int dsdt_len = *((int*) (ptr+1)) - 36; int dsdt_len = *((int*) (ptr+1)) - 36;
while (0 < dsdt_len--) { while (0 < dsdt_len--) {
@ -164,17 +186,29 @@ static int read_s5_addr(struct acpi_state *state) {
state->SCI_EN = 1; state->SCI_EN = 1;
} else { } else {
return ACPI_S5_PARSE_ERROR; return -1;
} }
} else { } else {
return ACPI_S5_PARSE_ERROR; return -1;
} }
return ACPI_SUCCESS; return -1;
} }
static void *acpi_find_table_rsdt(struct rsdt *rsdt, const char *identifier, int ident_len) {
int entries = (rsdt->h.length - sizeof(rsdt->h)) / 8;
static void *acpi_find_table(struct xsdt *xsdt, const char *identifier, int ident_len) { for (int i = 0; i < entries; i++) {
struct acpi_header *h = (struct acpi_header *) (uintptr_t) rsdt->sdt_pointers[i];
if (!strncmp(h->signature, identifier, ident_len))
return (void *)h;
}
// TABLE NOT FOUND
return NULL;
}
static void *acpi_find_table_xsdt(struct xsdt *xsdt, const char *identifier, int ident_len) {
int entries = (xsdt->h.length - sizeof(xsdt->h)) / 8; int entries = (xsdt->h.length - sizeof(xsdt->h)) / 8;
for (int i = 0; i < entries; i++) { for (int i = 0; i < entries; i++) {
@ -187,38 +221,72 @@ static void *acpi_find_table(struct xsdt *xsdt, const char *identifier, int iden
return NULL; return NULL;
} }
int acpi_init(void *rootsdp) { int acpi_init_rsdt(struct rsdt *rsdt) {
struct xsdp *xsdp = (struct xsdp *) rootsdp; if (!checksum((uint8_t *) &rsdt->h, rsdt->h.length))
return -1;
if (!checksum((uint8_t *)xsdp, sizeof(struct xsdp))) struct fadt *fadt = acpi_find_table_rsdt(rsdt, "FACP", 4);
return ACPI_MALFORMED_TABLE;
if (xsdp->revision != 2)
return ACPI_OLD_VERSION;
struct xsdt *xsdt = (struct xsdt *) (uintptr_t) xsdp->xsdt_addr;
if (!checksum((uint8_t *) &xsdt->h, xsdt->h.length))
return ACPI_MALFORMED_TABLE;
struct fadt *fadt = acpi_find_table(xsdt, "FACP", 4);
if (!fadt) if (!fadt)
return ACPI_MALFORMED_TABLE; return -1;
if (!checksum((uint8_t *) &fadt->h, fadt->h.length)) if (!checksum((uint8_t *) &fadt->h, fadt->h.length))
return ACPI_MALFORMED_TABLE; return -1;
state.fadt = *fadt; state.fadt = *fadt;
return -1;
}
int acpi_init_xsdt(struct xsdt *xsdt) {
if (!checksum((uint8_t *) &xsdt->h, xsdt->h.length))
return -1;
struct fadt *fadt = acpi_find_table_xsdt(xsdt, "FACP", 4);
if (!fadt)
return -1;
if (!checksum((uint8_t *) &fadt->h, fadt->h.length))
return -1;
state.fadt = *fadt;
return 0;
}
int acpi_init(void *rootsdp) {
struct rsdp *rsdp = (struct rsdp *) rootsdp;
if (!checksum((uint8_t *)rsdp, sizeof(struct xsdp)))
return -1;
int res;
if (rsdp->revision == 0) {
res = acpi_init_rsdt(
(struct rsdt *) (uintptr_t) rsdp->rsdt_addr
);
} else if (rsdp->revision == 2) {
struct xsdp *xsdp = (struct xsdp *) rsdp;
res = acpi_init_xsdt(
(struct xsdt *) (uintptr_t) xsdp->xsdt_addr
);
} else {
return -1;
}
if (res)
return res;
int ret = read_s5_addr(&state); int ret = read_s5_addr(&state);
if (!ret) if (!ret)
return ret; return ret;
outb(state.fadt.smi_command_port,state.fadt.acpi_enable); outb(state.fadt.smi_command_port,state.fadt.acpi_enable);
return ACPI_SUCCESS; return 0;
} }
int acpi_shutdown(void) { int acpi_shutdown(void) {
outw((unsigned int) state.fadt.pm1_a_control_block, state.SLP_TYPb | state.SLP_EN); outw((unsigned int) state.fadt.pm1_a_control_block, state.SLP_TYPb | state.SLP_EN);
return ACPI_FAILURE; return -1;
} }

View file

@ -1,80 +1,72 @@
#include "mboot.h" #include "mboot.h"
#include "serial.h" #include "serial.h"
#include "shim.h"
#include <stddef.h>
#include <lib.h> #include <lib.h>
static void read_cmdline(struct mboot_tag *tag, char *data, uint8_t len) { enum mboot_tag_type {
MBOOT_CMDLINE = 0,
MBOOT_MEMORYMAP = 6,
MBOOT_SYMBOLS = 9,
MBOOT_XSDP = 14
};
static void read_cmdline(struct boot_info *shim_info, char *data, uint8_t len) {
if (len >= CMDLINE_MAX) if (len >= CMDLINE_MAX)
len = CMDLINE_MAX; // truncate :( len = CMDLINE_MAX; // truncate :(
memcpy(tag->data.cmdline, data, len); memcpy(shim_info->cmdline, data, len);
tag->data.cmdline[len] = '\0'; shim_info->cmdline[len] = '\0';
} }
static void read_memorymap(struct mboot_tag *tag, uint64_t size, uint32_t *data) { static void read_memorymap(struct boot_info *shim_info, uint64_t size, uint32_t *data) {
tag->data.memory_map = (struct memory_map *) data; shim_info->map = (struct memory_map *) data;
tag->data.memory_map->size = size; shim_info->map->size = size;
} }
static void read_xsdp(struct mboot_tag *tag, char *data) { static void read_xsdp(struct boot_info *shim_info, char *data) {
tag->data.rootsdp = (void *) data; shim_info->acpi_table = (void *) data;
} }
static uint32_t *read_tag(struct mboot_info *info, uint32_t *data) { static uint32_t *read_tag(uint32_t *data, struct boot_info *shim_info) {
struct mboot_tag tag;
tag.type = *((uint16_t *)data);
tag.size = data[1];
tag.valid = 1;
uint8_t data_len = tag.size - 2 * sizeof(uint32_t); uint16_t type = *((uint16_t *)data);
uint32_t size = data[1];
switch (tag.type) { uint8_t data_len = size - 2 * sizeof(uint32_t);
switch (type) {
case MBOOT_CMDLINE: case MBOOT_CMDLINE:
read_cmdline(&tag, (char *)(data + 2), data_len); read_cmdline(shim_info, (char *)(data + 2), data_len);
break; break;
case MBOOT_MEMORYMAP: case MBOOT_MEMORYMAP:
read_memorymap(&tag, tag.size, data + 2); read_memorymap(shim_info, size, data + 2);
break; break;
case MBOOT_SYMBOLS: case MBOOT_SYMBOLS:
// TODO: // TODO:
goto done; break;
case MBOOT_XSDP: case MBOOT_XSDP:
read_xsdp(&tag, (char *) (data + 2)); read_xsdp(shim_info, (char *) (data + 2));
break; break;
default: default:
goto done; break;
} }
done: if(size % 8 != 0) {
size += 8 - (size % 8);
info->tags[tag.type] = tag;
if(tag.size % 8 != 0) {
tag.size += 8 - (tag.size % 8);
} }
return data + tag.size / sizeof(uint32_t); return data + size / sizeof(uint32_t);
} }
struct mboot_info mboot_load_info(const void *mboot_info) { void mboot_load_info(
struct mboot_info info = {0}; const void *mboot_info,
struct boot_info *shim_info
) {
uint32_t* data = (uint32_t*) mboot_info; uint32_t* data = (uint32_t*) mboot_info;
info.total_size = *data++; uint32_t total_size = *data++;
info.reserved = *data++; data++; //reserved
while((uint8_t*) data < (uint8_t*) mboot_info + total_size) {
while((uint8_t*) data < (uint8_t*) mboot_info + info.total_size) { data = read_tag(data, shim_info);
data = read_tag(&info, data);
} }
return info;
}
struct mboot_tag *mboot_get_tag(struct mboot_info *info, enum mboot_tag_type type) {
if (info->tags[type].valid) {
return &info->tags[type];
} else {
return NULL;
}
} }

View file

@ -1,44 +1,11 @@
#pragma once #pragma once
#include "memory.h" #include <shim.h>
#include <stdint.h> #include <memory.h>
#define CMDLINE_MAX 32
struct mboot_tag {
uint8_t valid; // if the tag at this location is set
uint32_t type;
uint32_t size;
union {
char cmdline[CMDLINE_MAX + 1];
struct memory_map *memory_map;
void *rootsdp;
} data;
};
enum mboot_tag_type {
MBOOT_CMDLINE = 0,
MBOOT_MEMORYMAP = 6,
MBOOT_SYMBOLS = 9,
MBOOT_XSDP = 14
};
struct mboot_info {
uint32_t total_size;
uint32_t reserved;
struct mboot_tag tags[22];
};
/** /**
* Loads the multi boot information * Loads the multi boot information
* @param mboot_info - the pointer passed from multiboot2 * @param mboot_info - the pointer passed from multiboot2
* @param shim_info - the info to be collected by shim
*/ */
struct mboot_info mboot_load_info(const void *mboot_info); void mboot_load_info(const void *mboot_info, struct boot_info *shim_info);
/**
* Gets a tag from multiboot
* @param type - the tag type
* @returns NULL - tag not loaded
* @returns tag - tag was loaded
*/
struct mboot_tag *mboot_get_tag(struct mboot_info *info, enum mboot_tag_type type);

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@ -18,15 +18,7 @@ void* amd64_shim(void *mboot_data_ptr) {
pic_remap(); pic_remap();
idt_init(); idt_init();
//kmap_page(mboot_data_ptr, mboot_data_ptr, F_WRITEABLE); mboot_load_info(mboot_data_ptr, &boot_info);
struct mboot_info mboot_info;
mboot_info = mboot_load_info(mboot_data_ptr);
struct mboot_tag *map_tag;
map_tag = mboot_get_tag(&mboot_info, MBOOT_MEMORYMAP);
boot_info.map = map_tag->data.memory_map;
return &boot_info; return &boot_info;
} }

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@ -1,3 +1,4 @@
#include "acpi.h"
#include <memory.h> #include <memory.h>
#include <lib.h> #include <lib.h>
#include <serial.h> #include <serial.h>
@ -30,10 +31,19 @@ void print_memory() {
void kmain(struct boot_info *info) { void kmain(struct boot_info *info) {
memory_init(info->map); memory_init(info->map);
int i = acpi_init(info->acpi_table);
char buf[20];
ltoa(i, buf, 10);
serial_out_str("acpi: ");
serial_out_str(buf);
serial_out_str("\n");
serial_out_str("entered kmain\n"); serial_out_str("entered kmain\n");
*(char*)(0xB8000 + 0x144) = 'h'; *(char*)(0xB8000 + 0x144) = 'h';
*(char*)(0xB8000 + 0x146) = 'i'; *(char*)(0xB8000 + 0x146) = 'i';
//fb_init(1024, 768); //fb_init(1024, 768);
acpi_shutdown();
while (1) { while (1) {
// loop so we dont halt // loop so we dont halt
// this allows interrupts to fire // this allows interrupts to fire