85 lines
3.1 KiB
C
85 lines
3.1 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. 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
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* 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
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <hv_lib.h>
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#include <cpu.h>
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#include <gdt.h>
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DEFINE_CPU_DATA(struct tss_64, tss);
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DEFINE_CPU_DATA(struct host_gdt, gdt);
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DEFINE_CPU_DATA(uint8_t[STACK_SIZE], mc_stack) __aligned(16);
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DEFINE_CPU_DATA(uint8_t[STACK_SIZE], df_stack) __aligned(16);
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DEFINE_CPU_DATA(uint8_t[STACK_SIZE], sf_stack) __aligned(16);
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static void set_tss_desc(union tss_64_descriptor *desc,
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void *tss, int tss_limit, int type)
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{
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uint32_t u1, u2, u3;
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u1 = ((uint64_t)tss << 16) & 0xFFFFFFFF;
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u2 = (uint64_t)tss & 0xFF000000;
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u3 = ((uint64_t)tss & 0x00FF0000) >> 16;
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desc->low32.value = u1 | (tss_limit & 0xFFFF);
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desc->base_addr_63_32 = (uint32_t)((uint64_t)tss >> 32);
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desc->high32.value = (u2 | ((uint32_t)type << 8) | 0x8000 | u3);
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}
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void load_gdtr_and_tr(void)
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{
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struct host_gdt *gdt = &get_cpu_var(gdt);
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struct host_gdt_descriptor gdtr;
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struct tss_64 *tss = &get_cpu_var(tss);
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/* first entry is not used */
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gdt->rsvd = 0xAAAAAAAAAAAAAAAA;
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/* ring 0 code sel descriptor */
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gdt->host_gdt_code_descriptor.value = 0x00Af9b000000ffff;
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/* ring 0 data sel descriptor */
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gdt->host_gdt_data_descriptor.value = 0x00cf93000000ffff;
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tss->ist1 = (uint64_t)get_cpu_var(mc_stack) + STACK_SIZE;
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tss->ist2 = (uint64_t)get_cpu_var(df_stack) + STACK_SIZE;
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tss->ist3 = (uint64_t)get_cpu_var(sf_stack) + STACK_SIZE;
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tss->ist4 = 0L;
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/* tss descriptor */
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set_tss_desc(&gdt->host_gdt_tss_descriptors,
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(void *)tss, sizeof(struct tss_64), TSS_AVAIL);
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gdtr.len = sizeof(struct host_gdt) - 1;
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gdtr.gdt = gdt;
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asm volatile ("lgdt %0" ::"m"(gdtr));
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CPU_LTR_EXECUTE(HOST_GDT_RING0_CPU_TSS_SEL);
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}
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