95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2020-2022 Martin Whitaker.
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//
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// Derived from an extract of memtest86+ lib.c:
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//
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// lib.c - MemTest-86 Version 3.4
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//
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// Released under version 2 of the Gnu Public License.
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// By Chris Brady
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#include "stddef.h"
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#include "boot.h"
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#include "bootparams.h"
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#include "efi.h"
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#include "io.h"
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#include "unistd.h"
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#include "hwctrl.h"
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//------------------------------------------------------------------------------
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// Private Variables
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//------------------------------------------------------------------------------
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static efi_runtime_services_t *efi_rs_table = NULL;
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//------------------------------------------------------------------------------
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// Public Functions
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//------------------------------------------------------------------------------
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void hwctrl_init(void)
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{
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boot_params_t *boot_params = (boot_params_t *)boot_params_addr;
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#ifdef __x86_64__
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if (boot_params->efi_info.loader_signature == EFI64_LOADER_SIGNATURE) {
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uintptr_t system_table_addr = (uintptr_t)boot_params->efi_info.sys_tab_hi << 32 | boot_params->efi_info.sys_tab;
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if (system_table_addr != 0) {
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efi64_system_table_t *sys_table = (efi64_system_table_t *)system_table_addr;
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efi_rs_table = (efi_runtime_services_t *)sys_table->runtime_services;
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}
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}
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#else
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if (boot_params->efi_info.loader_signature == EFI32_LOADER_SIGNATURE) {
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uintptr_t system_table_addr = boot_params->efi_info.sys_tab;
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if (system_table_addr != 0) {
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efi32_system_table_t *sys_table = (efi32_system_table_t *)system_table_addr;
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efi_rs_table = (efi_runtime_services_t *)(uintptr_t)sys_table->runtime_services;
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}
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}
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#endif
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}
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void reboot(void)
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{
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// Use cf9 method as first try
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uint8_t cf9 = inb(0xcf9) & ~6;
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outb(cf9|2, 0xcf9); // Request hard reset
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usleep(50);
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outb(cf9|6, 0xcf9); // Actually do the reset
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usleep(50);
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// If we have UEFI, try EFI reset service
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if (efi_rs_table != NULL) {
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efi_rs_table->reset_system(EFI_RESET_COLD, 0, 0);
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usleep(1000000);
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}
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// Still here? try the PORT 0x64 method
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outb(0xfe, 0x64);
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usleep(150000);
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if (efi_rs_table == NULL) {
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// In last resort, (very) obsolete reboot method using BIOS
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*((uint16_t *)0x472) = 0x1234;
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}
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}
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void floppy_off()
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{
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// Stop the floppy motor.
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outb(0x8, 0x3f2);
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}
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void cursor_off()
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{
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// Set HW cursor off screen.
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outb(0x0f, 0x3d4);
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outb(0xff, 0x3d5);
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outb(0x0e, 0x3d4);
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outb(0xff, 0x3d5);
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}
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