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Support rdmsr/wrmsr operations on FreeBSD

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So far, AMD Geode LX is the only user of this infrastructure. It needs
/dev/cpu0 from ports/sysutils on FreeBSD during runtime on Geode LX.

Corresponding to flashrom svn r690.

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Idwer Vollering <vidwer@gmail.com>
Acked-by: <putlinuxonit@gmail.com>
This commit is contained in:
Stefan Reinauer 2009-08-19 10:46:23 +00:00 committed by Carl-Daniel Hailfinger
parent dfade10e39
commit 173e3eaabe
2 changed files with 97 additions and 1 deletions
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12
flash.h
View File

@ -309,11 +309,21 @@ void *physmap(const char *descr, unsigned long phys_addr, size_t len);
void physunmap(void *virt_addr, size_t len);
int setup_cpu_msr(int cpu);
void cleanup_cpu_msr(void);
#ifndef __DARWIN__
#if !defined(__DARWIN__) && !defined(__FreeBSD__) && !defined(__DragonFly__)
typedef struct { uint32_t hi, lo; } msr_t;
msr_t rdmsr(int addr);
int wrmsr(int addr, msr_t msr);
#endif
#if defined(__FreeBSD__) || defined(__DragonFly__)
/* FreeBSD already has conflicting definitions for wrmsr/rdmsr. */
#undef rdmsr
#undef wrmsr
#define rdmsr freebsd_rdmsr
#define wrmsr freebsd_wrmsr
typedef struct { uint32_t hi, lo; } msr_t;
msr_t freebsd_rdmsr(int addr);
int freebsd_wrmsr(int addr, msr_t msr);
#endif
/* internal.c */
struct pci_dev *pci_dev_find_filter(struct pci_filter filter);

86
physmap.c
View File

@ -215,6 +215,91 @@ void cleanup_cpu_msr(void)
fd_msr = -1;
}
#else
#if defined(__FreeBSD__) || defined(__DragonFly__)
#include <sys/ioctl.h>
typedef struct {
int msr;
uint64_t data;
} cpu_msr_args_t;
#define CPU_RDMSR _IOWR('c', 1, cpu_msr_args_t)
#define CPU_WRMSR _IOWR('c', 2, cpu_msr_args_t)
static int fd_msr = -1;
msr_t rdmsr(int addr)
{
cpu_msr_args_t args;
msr_t msr = { 0xffffffff, 0xffffffff };
args.msr = addr;
if (ioctl(fd_msr, CPU_RDMSR, &args) < 0) {
perror("CPU_RDMSR");
close(fd_msr);
exit(1);
}
msr.lo = args.data & 0xffffffff;
msr.hi = args.data >> 32;
return msr;
}
int wrmsr(int addr, msr_t msr)
{
cpu_msr_args_t args;
args.msr = addr;
args.data = (((uint64_t)msr.hi) << 32) | msr.lo;
if (ioctl(fd_msr, CPU_WRMSR, &args) < 0) {
perror("CPU_WRMSR");
close(fd_msr);
exit(1);
}
return 0;
}
int setup_cpu_msr(int cpu)
{
char msrfilename[64];
memset(msrfilename, 0, 64);
sprintf(msrfilename, "/dev/cpu%d", cpu);
if (fd_msr != -1) {
printf("MSR was already initialized\n");
return -1;
}
fd_msr = open(msrfilename, O_RDWR);
if (fd_msr < 0) {
perror("Error while opening /dev/cpu0");
printf("Did you install ports/sysutils/devcpu?\n");
return -1;
}
return 0;
}
void cleanup_cpu_msr(void)
{
if (fd_msr == -1) {
printf("No MSR initialized.\n");
return;
}
close(fd_msr);
/* Clear MSR file descriptor */
fd_msr = -1;
}
#else
#ifdef __DARWIN__
int setup_cpu_msr(int cpu)
{
@ -251,4 +336,5 @@ void cleanup_cpu_msr(void)
}
#endif
#endif
#endif