source: mainline/kernel/arch/amd64/src/amd64.c@ e3fa92aa

/*
 * Copyright (c) 2005 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup amd64
 * @{
 */
/** @file
 */

#include <arch.h>

#include <arch/types.h>

#include <config.h>

#include <proc/thread.h>
#include <genarch/multiboot/multiboot.h>
#include <genarch/drivers/legacy/ia32/io.h>
#include <genarch/drivers/ega/ega.h>
#include <arch/drivers/vesa.h>
#include <genarch/drivers/i8042/i8042.h>
#include <genarch/kbrd/kbrd.h>
#include <arch/drivers/i8254.h>
#include <arch/drivers/i8259.h>
#include <arch/boot/boot.h>

#ifdef CONFIG_SMP
#include <arch/smp/apic.h>
#endif

#include <arch/bios/bios.h>
#include <arch/cpu.h>
#include <print.h>
#include <arch/cpuid.h>
#include <genarch/acpi/acpi.h>
#include <panic.h>
#include <interrupt.h>
#include <arch/syscall.h>
#include <arch/debugger.h>
#include <syscall/syscall.h>
#include <console/console.h>
#include <ddi/irq.h>
#include <sysinfo/sysinfo.h>

/** Disable I/O on non-privileged levels
 *
 * Clean IOPL(12,13) and NT(14) flags in EFLAGS register
 */
static void clean_IOPL_NT_flags(void)
{
        asm volatile (
                "pushfq\n"
                "pop %%rax\n"
                "and $~(0x7000), %%rax\n"
                "pushq %%rax\n"
                "popfq\n"
                ::: "%rax"
        );
}

/** Disable alignment check
 *
 * Clean AM(18) flag in CR0 register 
 */
static void clean_AM_flag(void)
{
        asm volatile (
                "mov %%cr0, %%rax\n"
                "and $~(0x40000), %%rax\n"
                "mov %%rax, %%cr0\n"
                ::: "%rax"
        );
}

/** Perform amd64-specific initialization before main_bsp() is called.
 *
 * @param signature Should contain the multiboot signature.
 * @param mi        Pointer to the multiboot information structure.
 */
void arch_pre_main(uint32_t signature, const multiboot_info_t *mi)
{
        /* Parse multiboot information obtained from the bootloader. */
        multiboot_info_parse(signature, mi);
        
#ifdef CONFIG_SMP
        /* Copy AP bootstrap routines below 1 MB. */
        memcpy((void *) AP_BOOT_OFFSET, (void *) BOOT_OFFSET,
            (size_t) &_hardcoded_unmapped_size);
#endif
}

void arch_pre_mm_init(void)
{
        /* Enable no-execute pages */
        set_efer_flag(AMD_NXE_FLAG);
        /* Enable FPU */
        cpu_setup_fpu();

        /* Initialize segmentation */
        pm_init();
        
        /* Disable I/O on nonprivileged levels
         * clear the NT (nested-thread) flag 
         */
        clean_IOPL_NT_flags();
        /* Disable alignment check */
        clean_AM_flag();

        if (config.cpu_active == 1) {
                interrupt_init();
                bios_init();
                
                /* PIC */
                i8259_init();
        }
}


void arch_post_mm_init(void)
{
        if (config.cpu_active == 1) {
                /* Initialize IRQ routing */
                irq_init(IRQ_COUNT, IRQ_COUNT);
                
                /* hard clock */
                i8254_init();
                
#ifdef CONFIG_FB
                if (vesa_present()) 
                        vesa_init();
                else
#endif
#ifdef CONFIG_EGA
                        ega_init(EGA_BASE, EGA_VIDEORAM);  /* video */
#else
                        {}
#endif
                
                /* Enable debugger */
                debugger_init();
                /* Merge all memory zones to 1 big zone */
                zone_merge_all();
        }
        
        /* Setup fast SYSCALL/SYSRET */
        syscall_setup_cpu();
}

void arch_post_cpu_init()
{
#ifdef CONFIG_SMP
        if (config.cpu_active > 1) {
                l_apic_init();
                l_apic_debug();
        }
#endif
}

void arch_pre_smp_init(void)
{
        if (config.cpu_active == 1) {
#ifdef CONFIG_SMP
                acpi_init();
#endif /* CONFIG_SMP */
        }
}

void arch_post_smp_init(void)
{
#ifdef CONFIG_PC_KBD
        /*
         * Initialize the i8042 controller. Then initialize the keyboard
         * module and connect it to i8042. Enable keyboard interrupts.
         */
        i8042_instance_t *i8042_instance = i8042_init((i8042_t *) I8042_BASE, IRQ_KBD);
        if (i8042_instance) {
                kbrd_instance_t *kbrd_instance = kbrd_init();
                if (kbrd_instance) {
                        indev_t *sink = stdin_wire();
                        indev_t *kbrd = kbrd_wire(kbrd_instance, sink);
                        i8042_wire(i8042_instance, kbrd);
                        trap_virtual_enable_irqs(1 << IRQ_KBD);
                }
        }
        
        /*
         * This is the necessary evil until the userspace driver is entirely
         * self-sufficient.
         */
        sysinfo_set_item_val("kbd", NULL, true);
        sysinfo_set_item_val("kbd.inr", NULL, IRQ_KBD);
        sysinfo_set_item_val("kbd.address.physical", NULL,
            (uintptr_t) I8042_BASE);
        sysinfo_set_item_val("kbd.address.kernel", NULL,
            (uintptr_t) I8042_BASE);
#endif
}

void calibrate_delay_loop(void)
{
        i8254_calibrate_delay_loop();
        if (config.cpu_active == 1) {
                /*
                 * This has to be done only on UP.
                 * On SMP, i8254 is not used for time keeping and its interrupt pin remains masked.
                 */
                i8254_normal_operation();
        }
}

/** Set thread-local-storage pointer
 *
 * TLS pointer is set in FS register. Unfortunately the 64-bit
 * part can be set only in CPL0 mode.
 *
 * The specs say, that on %fs:0 there is stored contents of %fs register,
 * we need not to go to CPL0 to read it.
 */
unative_t sys_tls_set(unative_t addr)
{
        THREAD->arch.tls = addr;
        write_msr(AMD_MSR_FS, addr);
        return 0;
}

/** Acquire console back for kernel
 *
 */
void arch_grab_console(void)
{
#ifdef CONFIG_FB
        if (vesa_present())
                vesa_redraw();
        else
#endif
#ifdef CONFIG_EGA
                ega_redraw();
#else
                {}
#endif
}

/** Return console to userspace
 *
 */
void arch_release_console(void)
{
}

/** Construct function pointer
 *
 * @param fptr   function pointer structure
 * @param addr   function address
 * @param caller calling function address
 *
 * @return address of the function pointer
 *
 */
void *arch_construct_function(fncptr_t *fptr, void *addr, void *caller)
{
        return addr;
}

void arch_reboot(void)
{
#ifdef CONFIG_PC_KBD
        i8042_cpu_reset((i8042_t *) I8042_BASE);
#endif
}

/** @}
 */