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https://git.stationery.faith/corn/corn.git
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better mboot
This commit is contained in:
parent
c9d9f1a9af
commit
9cc8dfcf0e
GPG key ID:
744AB800E383AE52
7 changed files with 156 additions and 131 deletions
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@ -1,13 +1,5 @@
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#pragma once
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enum acpi_status {
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ACPI_SUCCESS = 0,
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ACPI_FAILURE = -1,
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ACPI_MALFORMED_TABLE = -2,
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ACPI_OLD_VERSION = -4,
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ACPI_S5_PARSE_ERROR = -5,
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};
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/**
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* Loads the ACPI tables
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* https://en.wikipedia.org/wiki/ACPI
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@ -2,6 +2,10 @@
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#include <memory.h>
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#define CMDLINE_MAX 32
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struct boot_info {
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struct memory_map *map;
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void *acpi_table;
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char cmdline[CMDLINE_MAX];
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};
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@ -5,6 +5,7 @@
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#include <stddef.h>
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#include "bindings.h"
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#include "serial.h"
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/* global state, idk a better way rn */
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struct acpi_state state;
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@ -21,7 +22,18 @@ struct acpi_header {
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uint32_t creator_revision;
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};
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// root system descriptor pointer
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// ACPI 1.0
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struct rsdp {
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char signature[8];
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uint8_t checksum;
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char oemid[6];
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uint8_t revision;
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uint32_t rsdt_addr;
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} __attribute__((packed));
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// eXtended system descriptor pointer
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// ACPI 2.0
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struct xsdp {
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char signature[8];
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uint8_t checksum;
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@ -35,13 +47,21 @@ struct xsdp {
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uint8_t reserved[3];
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} __attribute__((packed));
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// root system descriptor table
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// ACPI 1.0
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struct rsdt {
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struct acpi_header h;
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uint64_t sdt_pointers[];
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};
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// eXtended system descriptor table
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// ACPI 2.0
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struct xsdt {
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struct acpi_header h;
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uint64_t sdt_pointers[];
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};
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// generic address structure
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struct gas {
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uint8_t address_space;
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@ -56,10 +76,10 @@ struct fadt {
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struct acpi_header h;
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uint32_t firmware_ctrl;
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uint32_t dsdt;
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// field used in ACPI 1.0; no longer in use, for compatibility only
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uint8_t reserved;
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uint8_t preferred_power_management_profile;
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uint16_t sci_interrupt;
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uint32_t smi_command_port;
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@ -92,23 +112,23 @@ struct fadt {
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uint8_t day_alarm;
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uint8_t month_alarm;
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uint8_t century;
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// reserved in ACPI 1.0; used since ACPI 2.0+
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uint16_t boot_architecture_flags;
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uint8_t reserved_2;
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uint32_t flags;
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// 12 byte structure; see below for details
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struct gas reset_reg;
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uint8_t reset_value;
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uint8_t reserved_3[3];
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// 64bit pointers - Available on ACPI 2.0+
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uint64_t x_firmware_control;
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uint64_t x_dsdt;
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struct gas x_pm1_a_event_block;
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struct gas x_pm1_b_event_block;
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struct gas x_pm1_a_control_block;
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@ -135,9 +155,11 @@ static bool checksum(uint8_t *data, size_t len) {
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}
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static int read_s5_addr(struct acpi_state *state) {
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serial_out_str("a");
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uintptr_t ptr = state->fadt.dsdt;
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char *s5_addr = (void*) (ptr + 36);
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serial_out_str("a");
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int dsdt_len = *((int*) (ptr+1)) - 36;
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while (0 < dsdt_len--) {
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if ( memcmp(s5_addr, "_S5_", 4) == 0)
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@ -164,17 +186,29 @@ static int read_s5_addr(struct acpi_state *state) {
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state->SCI_EN = 1;
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} else {
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return ACPI_S5_PARSE_ERROR;
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return -1;
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}
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} else {
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return ACPI_S5_PARSE_ERROR;
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return -1;
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}
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return ACPI_SUCCESS;
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return -1;
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}
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static void *acpi_find_table_rsdt(struct rsdt *rsdt, const char *identifier, int ident_len) {
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int entries = (rsdt->h.length - sizeof(rsdt->h)) / 8;
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static void *acpi_find_table(struct xsdt *xsdt, const char *identifier, int ident_len) {
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for (int i = 0; i < entries; i++) {
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struct acpi_header *h = (struct acpi_header *) (uintptr_t) rsdt->sdt_pointers[i];
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if (!strncmp(h->signature, identifier, ident_len))
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return (void *)h;
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}
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// TABLE NOT FOUND
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return NULL;
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}
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static void *acpi_find_table_xsdt(struct xsdt *xsdt, const char *identifier, int ident_len) {
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int entries = (xsdt->h.length - sizeof(xsdt->h)) / 8;
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for (int i = 0; i < entries; i++) {
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@ -187,38 +221,72 @@ static void *acpi_find_table(struct xsdt *xsdt, const char *identifier, int iden
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return NULL;
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}
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int acpi_init(void *rootsdp) {
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struct xsdp *xsdp = (struct xsdp *) rootsdp;
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int acpi_init_rsdt(struct rsdt *rsdt) {
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if (!checksum((uint8_t *) &rsdt->h, rsdt->h.length))
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return -1;
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if (!checksum((uint8_t *)xsdp, sizeof(struct xsdp)))
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return ACPI_MALFORMED_TABLE;
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if (xsdp->revision != 2)
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return ACPI_OLD_VERSION;
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struct xsdt *xsdt = (struct xsdt *) (uintptr_t) xsdp->xsdt_addr;
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if (!checksum((uint8_t *) &xsdt->h, xsdt->h.length))
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return ACPI_MALFORMED_TABLE;
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struct fadt *fadt = acpi_find_table(xsdt, "FACP", 4);
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struct fadt *fadt = acpi_find_table_rsdt(rsdt, "FACP", 4);
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if (!fadt)
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return ACPI_MALFORMED_TABLE;
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return -1;
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if (!checksum((uint8_t *) &fadt->h, fadt->h.length))
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return ACPI_MALFORMED_TABLE;
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return -1;
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state.fadt = *fadt;
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return -1;
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}
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int acpi_init_xsdt(struct xsdt *xsdt) {
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if (!checksum((uint8_t *) &xsdt->h, xsdt->h.length))
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return -1;
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struct fadt *fadt = acpi_find_table_xsdt(xsdt, "FACP", 4);
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if (!fadt)
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return -1;
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if (!checksum((uint8_t *) &fadt->h, fadt->h.length))
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return -1;
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state.fadt = *fadt;
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return 0;
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}
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int acpi_init(void *rootsdp) {
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struct rsdp *rsdp = (struct rsdp *) rootsdp;
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if (!checksum((uint8_t *)rsdp, sizeof(struct xsdp)))
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return -1;
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int res;
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if (rsdp->revision == 0) {
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res = acpi_init_rsdt(
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(struct rsdt *) (uintptr_t) rsdp->rsdt_addr
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);
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} else if (rsdp->revision == 2) {
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struct xsdp *xsdp = (struct xsdp *) rsdp;
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res = acpi_init_xsdt(
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(struct xsdt *) (uintptr_t) xsdp->xsdt_addr
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);
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} else {
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return -1;
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}
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if (res)
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return res;
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int ret = read_s5_addr(&state);
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if (!ret)
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return ret;
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outb(state.fadt.smi_command_port,state.fadt.acpi_enable);
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return ACPI_SUCCESS;
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return 0;
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}
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int acpi_shutdown(void) {
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outw((unsigned int) state.fadt.pm1_a_control_block, state.SLP_TYPb | state.SLP_EN);
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return ACPI_FAILURE;
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return -1;
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}
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@ -1,80 +1,72 @@
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#include "mboot.h"
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#include "serial.h"
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#include "shim.h"
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#include <stddef.h>
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#include <lib.h>
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static void read_cmdline(struct mboot_tag *tag, char *data, uint8_t len) {
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enum mboot_tag_type {
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MBOOT_CMDLINE = 0,
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MBOOT_MEMORYMAP = 6,
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MBOOT_SYMBOLS = 9,
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MBOOT_XSDP = 14
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};
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static void read_cmdline(struct boot_info *shim_info, char *data, uint8_t len) {
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if (len >= CMDLINE_MAX)
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len = CMDLINE_MAX; // truncate :(
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memcpy(tag->data.cmdline, data, len);
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tag->data.cmdline[len] = '\0';
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memcpy(shim_info->cmdline, data, len);
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shim_info->cmdline[len] = '\0';
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}
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static void read_memorymap(struct mboot_tag *tag, uint64_t size, uint32_t *data) {
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tag->data.memory_map = (struct memory_map *) data;
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tag->data.memory_map->size = size;
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static void read_memorymap(struct boot_info *shim_info, uint64_t size, uint32_t *data) {
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shim_info->map = (struct memory_map *) data;
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shim_info->map->size = size;
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}
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static void read_xsdp(struct mboot_tag *tag, char *data) {
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tag->data.rootsdp = (void *) data;
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static void read_xsdp(struct boot_info *shim_info, char *data) {
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shim_info->acpi_table = (void *) data;
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}
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static uint32_t *read_tag(struct mboot_info *info, uint32_t *data) {
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struct mboot_tag tag;
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tag.type = *((uint16_t *)data);
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tag.size = data[1];
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tag.valid = 1;
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static uint32_t *read_tag(uint32_t *data, struct boot_info *shim_info) {
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uint8_t data_len = tag.size - 2 * sizeof(uint32_t);
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uint16_t type = *((uint16_t *)data);
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uint32_t size = data[1];
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switch (tag.type) {
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uint8_t data_len = size - 2 * sizeof(uint32_t);
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switch (type) {
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case MBOOT_CMDLINE:
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read_cmdline(&tag, (char *)(data + 2), data_len);
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read_cmdline(shim_info, (char *)(data + 2), data_len);
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break;
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case MBOOT_MEMORYMAP:
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read_memorymap(&tag, tag.size, data + 2);
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read_memorymap(shim_info, size, data + 2);
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break;
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case MBOOT_SYMBOLS:
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// TODO:
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goto done;
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break;
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case MBOOT_XSDP:
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read_xsdp(&tag, (char *) (data + 2));
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read_xsdp(shim_info, (char *) (data + 2));
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break;
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default:
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goto done;
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break;
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}
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done:
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info->tags[tag.type] = tag;
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if(tag.size % 8 != 0) {
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tag.size += 8 - (tag.size % 8);
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if(size % 8 != 0) {
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size += 8 - (size % 8);
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}
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return data + tag.size / sizeof(uint32_t);
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return data + size / sizeof(uint32_t);
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}
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struct mboot_info mboot_load_info(const void *mboot_info) {
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struct mboot_info info = {0};
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void mboot_load_info(
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const void *mboot_info,
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struct boot_info *shim_info
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) {
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uint32_t* data = (uint32_t*) mboot_info;
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info.total_size = *data++;
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info.reserved = *data++;
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uint32_t total_size = *data++;
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data++; //reserved
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while((uint8_t*) data < (uint8_t*) mboot_info + info.total_size) {
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data = read_tag(&info, data);
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while((uint8_t*) data < (uint8_t*) mboot_info + total_size) {
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data = read_tag(data, shim_info);
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}
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return info;
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}
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struct mboot_tag *mboot_get_tag(struct mboot_info *info, enum mboot_tag_type type) {
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if (info->tags[type].valid) {
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return &info->tags[type];
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} else {
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return NULL;
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}
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}
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@ -1,44 +1,11 @@
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#pragma once
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#include "memory.h"
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#include <stdint.h>
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#define CMDLINE_MAX 32
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struct mboot_tag {
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uint8_t valid; // if the tag at this location is set
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uint32_t type;
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uint32_t size;
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union {
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char cmdline[CMDLINE_MAX + 1];
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struct memory_map *memory_map;
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void *rootsdp;
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} data;
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};
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enum mboot_tag_type {
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MBOOT_CMDLINE = 0,
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MBOOT_MEMORYMAP = 6,
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MBOOT_SYMBOLS = 9,
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MBOOT_XSDP = 14
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};
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struct mboot_info {
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uint32_t total_size;
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uint32_t reserved;
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struct mboot_tag tags[22];
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};
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#include <shim.h>
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#include <memory.h>
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/**
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* Loads the multi boot information
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* @param mboot_info - the pointer passed from multiboot2
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* @param shim_info - the info to be collected by shim
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*/
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struct mboot_info mboot_load_info(const void *mboot_info);
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/**
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* Gets a tag from multiboot
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* @param type - the tag type
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* @returns NULL - tag not loaded
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* @returns tag - tag was loaded
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*/
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struct mboot_tag *mboot_get_tag(struct mboot_info *info, enum mboot_tag_type type);
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void mboot_load_info(const void *mboot_info, struct boot_info *shim_info);
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@ -12,22 +12,14 @@
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static struct boot_info boot_info;
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void* amd64_shim(void *mboot_data_ptr) {
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serial_init();
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paging_init();
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pic_remap();
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idt_init();
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//kmap_page(mboot_data_ptr, mboot_data_ptr, F_WRITEABLE);
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struct mboot_info mboot_info;
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mboot_info = mboot_load_info(mboot_data_ptr);
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mboot_load_info(mboot_data_ptr, &boot_info);
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struct mboot_tag *map_tag;
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map_tag = mboot_get_tag(&mboot_info, MBOOT_MEMORYMAP);
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boot_info.map = map_tag->data.memory_map;
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return &boot_info;
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}
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10
src/kmain.c
10
src/kmain.c
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@ -1,3 +1,4 @@
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#include "acpi.h"
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#include <memory.h>
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#include <lib.h>
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#include <serial.h>
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@ -30,10 +31,19 @@ void print_memory() {
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void kmain(struct boot_info *info) {
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memory_init(info->map);
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int i = acpi_init(info->acpi_table);
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char buf[20];
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ltoa(i, buf, 10);
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serial_out_str("acpi: ");
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serial_out_str(buf);
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serial_out_str("\n");
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serial_out_str("entered kmain\n");
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*(char*)(0xB8000 + 0x144) = 'h';
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*(char*)(0xB8000 + 0x146) = 'i';
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//fb_init(1024, 768);
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acpi_shutdown();
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while (1) {
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// loop so we dont halt
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// this allows interrupts to fire
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