RK3588汇编代码

RK3588基于Linux kernel  L5.10.110

Linux git官方代码：​​Linux Kernel 5.10.110 released​​

以上两个进行比较，原厂主要修改head.S和entry.S vmlinux.lds.S

vmlinux.lds.S主要增加KVM相关配置。

再Linux/arch/arm64/kernel/目录下对比查看有以下汇编进行修改：

---

head.S

在__primary_switch中fdt传递，VHE

增加了init_kernel_el替换掉el2_setup,并增加了switch_to_vhe

 __enable_mmu

init_kernel_el新增函数

/*
 * end early head section, begin head code that is also used for
 * hotplug and needs to have the same protections as the text region
 */
  .section ".idmap.text","awx"

/*
 * Starting from EL2 or EL1, configure the CPU to execute at the highest
 * reachable EL supported by the kernel in a chosen default state. If dropping
 * from EL2 to EL1, configure EL2 before configuring EL1.
 *
 * Since we cannot always rely on ERET synchronizing writes to sysregs (e.g. if
 * SCTLR_ELx.EOS is clear), we place an ISB prior to ERET.
 *
 * Returns either BOOT_CPU_MODE_EL1 or BOOT_CPU_MODE_EL2 in w0 if
 * booted in EL1 or EL2 respectively.
 */
SYM_FUNC_START(init_kernel_el)
  mov_q x0, INIT_SCTLR_EL1_MMU_OFF
  msr sctlr_el1, x0

  mrs x0, CurrentEL
  cmp x0, #CurrentEL_EL2
  b.eq  init_el2

SYM_INNER_LABEL(init_el1, SYM_L_LOCAL)
  isb
  mov_q x0, INIT_PSTATE_EL1
  msr spsr_el1, x0
  msr elr_el1, lr
  mov w0, #BOOT_CPU_MODE_EL1
  eret

SYM_INNER_LABEL(init_el2, SYM_L_LOCAL)
  mov_q x0, HCR_HOST_NVHE_FLAGS
  msr hcr_el2, x0
  isb

  init_el2_state

  /* Hypervisor stub */
  adr_l x0, __hyp_stub_vectors
  msr vbar_el2, x0
  isb

  msr elr_el2, lr
  mov w0, #BOOT_CPU_MODE_EL2
  eret
SYM_FUNC_END(init_kernel_el)

---

entry.S