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/* SPDX-License-Identifier: GPL-2.0-only */
#include <cpu/x86/mtrr.h>
#include <cpu/x86/msr.h>
#define MTRR_HIGH_MASK $((1 << (CONFIG_CPU_ADDR_BITS - 32)) - 1)
/*
* Configure the MTRRs to cache the BIOS ACM. No general-purpose
* registers are preserved. Inputs are taken from SSE registers:
*
* %xmm0: BIOS ACM base
* %xmm1: BIOS ACM size
*
* These two SSE registers are not preserved, but the others are.
*/
.macro SET_UP_MTRRS_FOR_BIOS_ACM
/* Get the number of variable MTRRs */
movl $(MTRR_CAP_MSR), %ecx
rdmsr
andl $(0xff), %eax
/* Initialize ECX */
movl $(MTRR_PHYS_BASE(0)), %ecx
jmp cond_allocate_var_mtrrs
body_allocate_var_mtrrs:
/* Program MTRR base */
xorl %edx, %edx
movd %xmm0, %eax
orl $(MTRR_TYPE_WRBACK), %eax
wrmsr
incl %ecx /* Move index to MTRR_PHYS_MASK */
/* Temporarily transfer MSR index to EDX so that CL can be used */
movl %ecx, %edx
/* Determine next size to cache */
bsr %ebx, %ecx
movl $(1), %ebx
shl %cl, %ebx /* Can only use CL here */
/* Restore ECX */
movl %edx, %ecx
/* Update saved base address */
addl %ebx, %eax
movd %eax, %xmm0
/* Update saved remaining size */
movd %xmm1, %eax
subl %ebx, %eax
movd %eax, %xmm1
/* Program MTRR mask */
movl MTRR_HIGH_MASK, %edx
xorl %eax, %eax
subl %ebx, %eax /* %eax = 4GIB - size to cache */
orl $(MTRR_PHYS_MASK_VALID), %eax
wrmsr
incl %ecx /* Move index to next MTRR_PHYS_BASE */
cond_allocate_var_mtrrs:
/* Check if we still need to cache something */
movd %xmm1, %ebx
andl %ebx, %ebx
jnz body_allocate_var_mtrrs
.endm
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