Fix lance segfaults

[qemu.git] / cache-utils.c

#include "cache-utils.h"

#if defined(_ARCH_PPC)
struct qemu_cache_conf qemu_cache_conf = {
    .dcache_bsize = 16,
    .icache_bsize = 16
};

#if defined _AIX
#include <sys/systemcfg.h>

static void ppc_init_cacheline_sizes(void)
{
    qemu_cache_conf.icache_bsize = _system_configuration.icache_line;
    qemu_cache_conf.dcache_bsize = _system_configuration.dcache_line;
}

#elif defined __linux__

#define QEMU_AT_NULL        0
#define QEMU_AT_DCACHEBSIZE 19
#define QEMU_AT_ICACHEBSIZE 20

static void ppc_init_cacheline_sizes(char **envp)
{
    unsigned long *auxv;

    while (*envp++);

    for (auxv = (unsigned long *) envp; *auxv != QEMU_AT_NULL; auxv += 2) {
        switch (*auxv) {
        case QEMU_AT_DCACHEBSIZE: qemu_cache_conf.dcache_bsize = auxv[1]; break;
        case QEMU_AT_ICACHEBSIZE: qemu_cache_conf.icache_bsize = auxv[1]; break;
        default: break;
        }
    }
}

#elif defined __APPLE__
#include <stdio.h>
#include <sys/types.h>
#include <sys/sysctl.h>

static void ppc_init_cacheline_sizes(void)
{
    size_t len;
    unsigned cacheline;
    int name[2] = { CTL_HW, HW_CACHELINE };

    len = sizeof(cacheline);
    if (sysctl(name, 2, &cacheline, &len, NULL, 0)) {
        perror("sysctl CTL_HW HW_CACHELINE failed");
    } else {
        qemu_cache_conf.dcache_bsize = cacheline;
        qemu_cache_conf.icache_bsize = cacheline;
    }
}
#endif

#ifdef __linux__
void qemu_cache_utils_init(char **envp)
{
    ppc_init_cacheline_sizes(envp);
}
#else
void qemu_cache_utils_init(char **envp)
{
    (void) envp;
    ppc_init_cacheline_sizes();
}
#endif

#endif /* _ARCH_PPC */