71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/*
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* Copyright (c) 2009 Corey Tabaka
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <debug.h>
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#include <arch.h>
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#include <arch/ops.h>
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#include <arch/x86.h>
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#include <arch/x86/mmu.h>
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#include <arch/x86/descriptor.h>
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#include <platform.h>
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#include <sys/types.h>
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#include <string.h>
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static tss_t system_tss;
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void arch_early_init(void)
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{
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x86_mmu_init();
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platform_init_mmu_mappings();
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/* enable caches here for now */
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clear_in_cr0(X86_CR0_NW | X86_CR0_CD);
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memset(&system_tss, 0, sizeof(tss_t));
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system_tss.esp0 = 0;
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system_tss.ss0 = DATA_SELECTOR;
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system_tss.ss1 = 0;
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system_tss.ss2 = 0;
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system_tss.eflags = 0x00003002;
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system_tss.bitmap = offsetof(tss_t, tss_bitmap);
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system_tss.trace = 1; // trap on hardware task switch
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set_global_desc(TSS_SELECTOR, &system_tss, sizeof(tss_t), 1, 0, 0, SEG_TYPE_TSS, 0, 0);
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x86_ltr(TSS_SELECTOR);
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}
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void arch_init(void)
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{
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}
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uint32_t arch_cycle_count(void)
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{
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uint32_t timestamp;
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rdtscl(timestamp);
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return timestamp;
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}
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