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https://github.com/projectacrn/acrn-hypervisor.git
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4f6aa38ea5
The CONFIG_LOW_RAM_SIZE is used to describe the size of trampoline code that is never changed. And it totally confused user to configure it. This patch hard code it to 1MB and remove the macro for configuration. In the trampoline related code, use ld_trampoline_end and ld_trampoline_start symbol to calculate the real size. Tracked-On: #6805 Signed-off-by: Yuanyuan Zhao <yuanyuan.zhao@linux.intel.com> Reviewed-by: Wang, Yu1 <yu1.wang@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>
129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <types.h>
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#include <asm/mmu.h>
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#include <asm/per_cpu.h>
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#include <asm/trampoline.h>
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#include <reloc.h>
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#include <asm/boot/ld_sym.h>
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#include <asm/e820.h>
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static uint64_t trampoline_start16_paddr;
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/*
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* Because trampoline code is relocated in different way, if HV code
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* accesses trampoline using relative addressing, it needs to take
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* out the HV relocation delta
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*
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* This function is valid if:
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* - The hpa of HV code is always higher than trampoline code
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* - The HV code is always relocated to higher address, compared
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* with CONFIG_HV_RAM_START
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*/
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static uint64_t trampoline_relo_addr(const void *addr)
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{
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return (uint64_t)addr - get_hv_image_delta();
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}
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uint64_t read_trampoline_sym(const void *sym)
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{
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uint64_t *hva = (uint64_t *)(hpa2hva(trampoline_start16_paddr) + trampoline_relo_addr(sym));
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return *hva;
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}
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void write_trampoline_sym(const void *sym, uint64_t val)
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{
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uint64_t *hva = (uint64_t *)(hpa2hva(trampoline_start16_paddr) + trampoline_relo_addr(sym));
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*hva = val;
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clflush(hva);
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}
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void write_trampoline_stack_sym(uint16_t pcpu_id)
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{
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uint64_t *hva, stack_sym_addr;
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hva = (uint64_t *)(hpa2hva(trampoline_start16_paddr) + trampoline_relo_addr(secondary_cpu_stack));
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stack_sym_addr = (uint64_t)&per_cpu(stack, pcpu_id)[CONFIG_STACK_SIZE - 1];
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stack_sym_addr &= ~(CPU_STACK_ALIGN - 1UL);
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*hva = stack_sym_addr;
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clflush(hva);
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}
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uint64_t get_trampoline_start16_paddr(void)
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{
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return trampoline_start16_paddr;
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}
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static void update_trampoline_code_refs(uint64_t dest_pa)
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{
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void *ptr;
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uint64_t val;
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uint32_t i;
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/*
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* calculate the fixup CS:IP according to fixup target address
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* dynamically.
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*
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* trampoline code starts in real mode,
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* so the target addres is HPA
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*/
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val = dest_pa + trampoline_relo_addr(&trampoline_fixup_target);
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ptr = hpa2hva(dest_pa + trampoline_relo_addr(&trampoline_fixup_cs));
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*(uint16_t *)(ptr) = (uint16_t)((val >> 4U) & 0xFFFFU);
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ptr = hpa2hva(dest_pa + trampoline_relo_addr(&trampoline_fixup_ip));
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*(uint16_t *)(ptr) = (uint16_t)(val & 0xfU);
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/* Update temporary page tables */
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ptr = hpa2hva(dest_pa + trampoline_relo_addr(&cpu_boot_page_tables_ptr));
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*(uint32_t *)(ptr) += (uint32_t)dest_pa;
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ptr = hpa2hva(dest_pa + trampoline_relo_addr(&cpu_boot_page_tables_start));
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*(uint64_t *)(ptr) += dest_pa;
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ptr = hpa2hva(dest_pa + trampoline_relo_addr(&trampoline_pdpt_addr));
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for (i = 0U; i < 4U; i++) {
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*(uint64_t *)(ptr + sizeof(uint64_t) * i) += dest_pa;
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}
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/* update the gdt base pointer with relocated offset */
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ptr = hpa2hva(dest_pa + trampoline_relo_addr(&trampoline_gdt_ptr));
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*(uint64_t *)(ptr + 2) += dest_pa;
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/* update trampoline jump pointer with relocated offset */
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ptr = hpa2hva(dest_pa + trampoline_relo_addr(&trampoline_start64_fixup));
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*(uint32_t *)ptr += (uint32_t)dest_pa;
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/* update trampoline's main entry pointer */
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ptr = hpa2hva(dest_pa + trampoline_relo_addr(main_entry));
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*(uint64_t *)ptr += get_hv_image_delta();
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}
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uint64_t prepare_trampoline(void)
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{
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uint64_t trampline_size, trampoline_pa;
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trampline_size = (uint64_t)(&ld_trampoline_end - &ld_trampoline_start);
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trampoline_pa = e820_alloc_memory(trampline_size, MEM_1M);
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pr_dbg("trampoline code: %lx trampline_size %x", trampoline_pa, trampline_size);
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/* Copy segment for AP initialization code below 1MB */
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(void)memcpy_s(hpa2hva(trampoline_pa), (size_t)trampline_size, &ld_trampoline_load,
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(size_t)trampline_size);
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update_trampoline_code_refs(trampoline_pa);
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cpu_memory_barrier();
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flush_cache_range(hpa2hva(trampoline_pa), trampline_size);
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trampoline_start16_paddr = trampoline_pa;
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return trampoline_pa;
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}
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