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1810 decky 1
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup xen32
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 * @{
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 */
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/** @file
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 */
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#include <arch.h>
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#include <main/main.h>
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#include <arch/types.h>
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#include <typedefs.h>
1824 decky 40
#include <align.h>
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#include <arch/pm.h>
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#include <arch/drivers/xconsole.h>
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#include <arch/mm/page.h>
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#include <arch/context.h>
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#include <config.h>
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#include <arch/interrupt.h>
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#include <arch/asm.h>
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#include <genarch/acpi/acpi.h>
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#include <arch/bios/bios.h>
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#include <arch/boot/boot.h>
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#include <arch/mm/memory_init.h>
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#include <interrupt.h>
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#include <arch/debugger.h>
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#include <proc/thread.h>
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#include <syscall/syscall.h>
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#include <console/console.h>
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start_info_t start_info;
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memzone_t meminfo;
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extern void xen_callback(void);
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extern void xen_failsafe_callback(void);
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1824 decky 71
void arch_pre_main(void)
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{
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    xen_vm_assist(VMASST_CMD_ENABLE, VMASST_TYPE_WRITABLE_PAGETABLES);
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    pte_t pte;
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    memsetb((uintptr_t) &pte, sizeof(pte), 0);
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    pte.present = 1;
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    pte.writeable = 1;
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    pte.frame_address = ADDR2PFN((uintptr_t) start_info.shared_info);
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    xen_update_va_mapping(&shared_info, pte, UVMF_INVLPG);
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    pte.present = 1;
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    pte.writeable = 1;
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    pte.frame_address = start_info.console_mfn;
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    xen_update_va_mapping(&console_page, pte, UVMF_INVLPG);
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    xen_set_callbacks(XEN_CS, xen_callback, XEN_CS, xen_failsafe_callback);
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1824 decky 90
    /* Create identity mapping */
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    meminfo.start = ADDR2PFN(ALIGN_UP(KA2PA(start_info.ptl0), PAGE_SIZE)) + start_info.pt_frames;
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    meminfo.size = start_info.frames - meminfo.start;
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    meminfo.reserved = 0;
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    uintptr_t pa;
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    index_t last_ptl0 = 0;
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    for (pa = PFN2ADDR(meminfo.start); pa < PFN2ADDR(meminfo.start + meminfo.size); pa += FRAME_SIZE) {
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        uintptr_t va = PA2KA(pa);
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        if ((PTL0_INDEX(va) != last_ptl0) && (GET_PTL1_FLAGS(start_info.ptl0, PTL0_INDEX(va)) & PAGE_NOT_PRESENT)) {
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            /* New page directory entry needed */
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            uintptr_t tpa = PFN2ADDR(meminfo.start + meminfo.reserved);
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            uintptr_t tva = PA2KA(tpa);
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            memsetb(tva, PAGE_SIZE, 0);
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            pte_t *tptl3 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(start_info.ptl0, PTL0_INDEX(tva)));
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            SET_FRAME_FLAGS(tptl3, PTL3_INDEX(tva), PAGE_PRESENT);
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            SET_PTL1_ADDRESS(start_info.ptl0, PTL0_INDEX(va), tpa);
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            last_ptl0 = PTL0_INDEX(va);
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            meminfo.reserved++;
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        }
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        pte_t *ptl3 = (pte_t *) PA2KA(GET_PTL1_ADDRESS(start_info.ptl0, PTL0_INDEX(va)));
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        SET_FRAME_ADDRESS(ptl3, PTL3_INDEX(va), pa);
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        SET_FRAME_FLAGS(ptl3, PTL3_INDEX(va), PAGE_PRESENT | PAGE_WRITE);
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    }
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    /* Put initial stack safely in the mapped area */
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    stack_safe = PA2KA(PFN2ADDR(meminfo.start + meminfo.reserved));
1824 decky 124
}
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void arch_pre_mm_init(void)
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{
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    pm_init();
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    if (config.cpu_active == 1) {
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//      bios_init();
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        exc_register(VECTOR_SYSCALL, "syscall", (iroutine) syscall);
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        #ifdef CONFIG_SMP
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        exc_register(VECTOR_TLB_SHOOTDOWN_IPI, "tlb_shootdown",
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                 (iroutine) tlb_shootdown_ipi);
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        #endif /* CONFIG_SMP */
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    }
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}
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void arch_post_mm_init(void)
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{
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    if (config.cpu_active == 1) {
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        /* video */
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        xen_console_init();
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        /* Enable debugger */
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        debugger_init();
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        /* Merge all memory zones to 1 big zone */
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        zone_merge_all();
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    }
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}
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void arch_pre_smp_init(void)
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{
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    if (config.cpu_active == 1) {
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        memory_print_map();
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        #ifdef CONFIG_SMP
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        acpi_init();
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        #endif /* CONFIG_SMP */
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    }
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}
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void arch_post_smp_init(void)
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{
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}
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void calibrate_delay_loop(void)
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{
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//  i8254_calibrate_delay_loop();
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    if (config.cpu_active == 1) {
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        /*
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         * This has to be done only on UP.
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         * On SMP, i8254 is not used for time keeping and its interrupt pin remains masked.
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         */
1816 decky 177
//      i8254_normal_operation();
1810 decky 178
    }
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}
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/** Set thread-local-storage pointer
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 *
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 * TLS pointer is set in GS register. That means, the GS contains
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 * selector, and the descriptor->base is the correct address.
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 */
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unative_t sys_tls_set(unative_t addr)
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{
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    THREAD->arch.tls = addr;
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    set_tls_desc(addr);
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    return 0;
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}
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/** Acquire console back for kernel
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 *
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 */
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void arch_grab_console(void)
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{
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}
1816 decky 200
 
1810 decky 201
/** Return console to userspace
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 *
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 */
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void arch_release_console(void)
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{
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}
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/** @}
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 */