Remove dead MTRR code from the kernel.
This commit is contained in:
Jonas 'Sortie' Termansen
parent
6cab6d7aff
commit
3487b62152
|
|
@ -56,7 +56,6 @@ ifdef X86FAMILY
|
|||
$(CPUDIR)/syscall.o \
|
||||
x86-family/cmos.o \
|
||||
x86-family/time.o \
|
||||
x86-family/mtrr.o \
|
||||
x86-family/pat.o \
|
||||
x86-family/float.o \
|
||||
x86-family/ps2.o \
|
||||
|
|
|
|||
|
|
@ -1,47 +0,0 @@
|
|||
/*******************************************************************************
|
||||
|
||||
Copyright(C) Jonas 'Sortie' Termansen 2013.
|
||||
|
||||
This file is part of Sortix.
|
||||
|
||||
Sortix is free software: you can redistribute it and/or modify it under the
|
||||
terms of the GNU General Public License as published by the Free Software
|
||||
Foundation, either version 3 of the License, or (at your option) any later
|
||||
version.
|
||||
|
||||
Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
|
||||
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
||||
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
|
||||
details.
|
||||
|
||||
You should have received a copy of the GNU General Public License along with
|
||||
Sortix. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
sortix/kernel/mtrr.h
|
||||
Functions to manipulate Memory Type Range Registers.
|
||||
|
||||
*******************************************************************************/
|
||||
|
||||
#ifndef INCLUDE_SORTIX_KERNEL_MTRR_H
|
||||
#define INCLUDE_SORTIX_KERNEL_MTRR_H
|
||||
|
||||
#include <stddef.h>
|
||||
#include <stdint.h>
|
||||
|
||||
#include <sortix/kernel/decl.h>
|
||||
|
||||
namespace Sortix {
|
||||
|
||||
#if defined(__i386__) || defined(__x86_64__)
|
||||
|
||||
bool IsMTRRSupported();
|
||||
const char* SetupMTRRForWC(addr_t base, size_t size, int* ret = NULL);
|
||||
void EnableMTRR(int mtrr);
|
||||
void DisableMTRR(int mtrr);
|
||||
void CopyMTRR(int dst, int src);
|
||||
|
||||
#endif
|
||||
|
||||
} // namespace Sortix
|
||||
|
||||
#endif
|
||||
|
|
@ -1,194 +0,0 @@
|
|||
/*******************************************************************************
|
||||
|
||||
Copyright(C) Jonas 'Sortie' Termansen 2012, 2013.
|
||||
Copyright(C) Free Software Foundation, Inc. 2005, 2006, 2007, 2008, 2009.
|
||||
|
||||
This file is part of Sortix.
|
||||
|
||||
Sortix is free software: you can redistribute it and/or modify it under the
|
||||
terms of the GNU General Public License as published by the Free Software
|
||||
Foundation, either version 3 of the License, or (at your option) any later
|
||||
version.
|
||||
|
||||
Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
|
||||
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
||||
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
|
||||
details.
|
||||
|
||||
You should have received a copy of the GNU General Public License along with
|
||||
Sortix. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
x86-family/mtrr.cpp
|
||||
Functions to access and modify memory type range registers. This is in part
|
||||
based on code from GNU GRUB.
|
||||
|
||||
*******************************************************************************/
|
||||
|
||||
#include <msr.h>
|
||||
#include <stdint.h>
|
||||
|
||||
#include <sortix/kernel/cpuid.h>
|
||||
#include <sortix/kernel/kernel.h>
|
||||
#include <sortix/kernel/mtrr.h>
|
||||
|
||||
namespace Sortix {
|
||||
|
||||
const uint32_t bit_MTRR = 0x00001000U;
|
||||
|
||||
bool IsMTRRSupported()
|
||||
{
|
||||
if ( !IsCPUIdSupported() )
|
||||
return false;
|
||||
uint32_t eax, ebx, ecx, edx;
|
||||
cpuid(1, eax, ebx, ecx, edx);
|
||||
uint32_t features = edx;
|
||||
return features & bit_MTRR;
|
||||
}
|
||||
|
||||
#define mtrr_base(reg) (0x200 + (reg) * 2 + 0)
|
||||
#define mtrr_mask(reg) (0x200 + (reg) * 2 + 1)
|
||||
|
||||
static const uint64_t MTRR_MASK_VALID = 0x800;
|
||||
|
||||
void EnableMTRR(int mtrr)
|
||||
{
|
||||
wrmsr(mtrr_mask(mtrr), rdmsr(mtrr_mask(mtrr)) | MTRR_MASK_VALID);
|
||||
}
|
||||
|
||||
void DisableMTRR(int mtrr)
|
||||
{
|
||||
wrmsr(mtrr_mask(mtrr), rdmsr(mtrr_mask(mtrr)) & ~MTRR_MASK_VALID);
|
||||
}
|
||||
|
||||
void CopyMTRR(int dst, int src)
|
||||
{
|
||||
uint64_t base = rdmsr(mtrr_base(src));
|
||||
uint64_t mask = rdmsr(mtrr_mask(src));
|
||||
wrmsr(mtrr_base(dst), base);
|
||||
wrmsr(mtrr_mask(dst), mask);
|
||||
}
|
||||
|
||||
// TODO: Yes, returning a string as an error and giving the result in a pointer
|
||||
// is very bad design. Please fix this at some point. Also improve the code such
|
||||
// that it is more flexible.
|
||||
const char* SetupMTRRForWC(addr_t base, size_t size, int* ret)
|
||||
{
|
||||
uint32_t eax, ebx, ecx, edx;
|
||||
uint32_t mtrrcap;
|
||||
int var_mtrrs;
|
||||
uint32_t max_extended_cpuid;
|
||||
uint32_t maxphyaddr;
|
||||
uint64_t fb_base, fb_size;
|
||||
uint64_t size_bits, fb_mask;
|
||||
uint32_t bits_lo, bits_hi;
|
||||
uint64_t bits;
|
||||
int i, first_unused = -1;
|
||||
uint32_t base_lo, base_hi, mask_lo, mask_hi;
|
||||
|
||||
fb_base = (uint64_t) base;
|
||||
fb_size = (uint64_t) size;
|
||||
|
||||
// Check that fb_base and fb_size can be represented using a single MTRR.
|
||||
|
||||
if ( fb_base < 1 << 20 )
|
||||
return "below 1MB, so covered by fixed-range MTRRs";
|
||||
if ( fb_base >= 1LL << 36 )
|
||||
return "over 36 bits, so out of range";
|
||||
if ( fb_size < 1 << 12 )
|
||||
return "variable-range MTRRs must cover at least 4KB";
|
||||
|
||||
size_bits = fb_size;
|
||||
while ( size_bits > 1 )
|
||||
size_bits >>= 1;
|
||||
if ( size_bits != 1 )
|
||||
return "not a power of two";
|
||||
|
||||
if ( fb_base & (fb_size - 1) )
|
||||
return "not aligned on size boundary";
|
||||
|
||||
fb_mask = ~(fb_size - 1);
|
||||
|
||||
// Check CPU capabilities.
|
||||
|
||||
if ( !IsCPUIdSupported() )
|
||||
return "cpuid not supported, therefore mtrr not supported";
|
||||
|
||||
if ( !IsMTRRSupported() )
|
||||
return "cpu does not support mtrr";
|
||||
|
||||
rdmsr_split(0xFE, &eax, &edx);
|
||||
mtrrcap = eax;
|
||||
if ( !(mtrrcap & 0x00000400) ) /* write-combining */
|
||||
return "write combining doesn't seem to be supported";
|
||||
var_mtrrs = mtrrcap & 0xFF;
|
||||
|
||||
cpuid(0x80000000, eax, ebx, ecx, edx);
|
||||
max_extended_cpuid = eax;
|
||||
if ( max_extended_cpuid >= 0x80000008 )
|
||||
{
|
||||
cpuid(0x80000008, eax, ebx, ecx, edx);
|
||||
maxphyaddr = eax & 0xFF;
|
||||
}
|
||||
else
|
||||
maxphyaddr = 36;
|
||||
bits_lo = 0xFFFFF000; /* assume maxphyaddr >= 36 */
|
||||
bits_hi = (1 << (maxphyaddr - 32)) - 1;
|
||||
bits = bits_lo | (uint64_t) bits_hi << 32;
|
||||
|
||||
// Check whether an MTRR already covers this region. If not, take an unused
|
||||
// one if possible.
|
||||
for ( i = 0; i < var_mtrrs; i++ )
|
||||
{
|
||||
rdmsr_split(mtrr_mask(i), &eax, &edx);
|
||||
mask_lo = eax;
|
||||
mask_hi = edx;
|
||||
if ( mask_lo & MTRR_MASK_VALID )
|
||||
{
|
||||
uint64_t real_base, real_mask;
|
||||
|
||||
rdmsr_split(mtrr_base(i), &eax, &edx);
|
||||
base_lo = eax;
|
||||
base_hi = edx;
|
||||
|
||||
real_base = (uint64_t) (base_hi & bits_hi) << 32 |
|
||||
(base_lo & bits_lo);
|
||||
real_mask = (uint64_t) (mask_hi & bits_hi) << 32 |
|
||||
(mask_lo & bits_lo);
|
||||
|
||||
if ( real_base < fb_base + fb_size &&
|
||||
real_base + (~real_mask & bits) >= fb_base )
|
||||
return "region already covered by another mtrr";
|
||||
}
|
||||
else if ( first_unused < 0 )
|
||||
first_unused = i;
|
||||
}
|
||||
|
||||
if ( first_unused < 0 )
|
||||
return "all MTRRs in use";
|
||||
|
||||
// Set up the first unused MTRR we found.
|
||||
rdmsr_split(mtrr_base(first_unused), &eax, &edx);
|
||||
base_lo = eax;
|
||||
base_hi = edx;
|
||||
rdmsr_split(mtrr_mask(first_unused), &eax, &edx);
|
||||
mask_lo = eax;
|
||||
mask_hi = edx;
|
||||
|
||||
base_lo = (base_lo & ~bits_lo & ~0xFF) |
|
||||
(fb_base & bits_lo) | 0x01 /* WC */;
|
||||
base_hi = (base_hi & ~bits_hi) |
|
||||
((fb_base >> 32) & bits_hi);
|
||||
wrmsr_split(mtrr_base(first_unused), base_lo, base_hi);
|
||||
mask_lo = (mask_lo & ~bits_lo) |
|
||||
(fb_mask & bits_lo) | MTRR_MASK_VALID;
|
||||
mask_hi = (mask_hi & ~bits_hi) |
|
||||
((fb_mask >> 32) & bits_hi);
|
||||
wrmsr_split(mtrr_mask(first_unused), mask_lo, mask_hi);
|
||||
|
||||
if ( ret )
|
||||
*ret = first_unused;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
} // namespace Sortix
|
||||
Loading…
Reference in New Issue