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Use pmap_change_attr() to setup a write combine attribute for our

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device memory, rather than relying on the less reliable MTRR method
used by mem_range_attr_set().

Glanced at by: jhb
This commit is contained in:
Andrew Gallatin 2007-06-05 15:02:14 +00:00
parent ca222e2e54
commit c2c14a696c
1 changed files with 14 additions and 1 deletions
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15
sys/dev/mxge/if_mxge.c
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@ -80,6 +80,10 @@ __FBSDID("$FreeBSD$");
#include <vm/vm.h> /* for pmap_mapdev() */
#include <vm/pmap.h>
#if defined(__i386) || defined(__amd64)
#include <machine/specialreg.h>
#endif
#include <dev/mxge/mxge_mcp.h>
#include <dev/mxge/mcp_gen_header.h>
#include <dev/mxge/if_mxge_var.h>
@ -146,8 +150,17 @@ mxge_enable_wc(mxge_softc_t *sc)
vm_offset_t len;
int err, action;
pa = rman_get_start(sc->mem_res);
len = rman_get_size(sc->mem_res);
#if defined(__i386) || defined(__amd64)
err = pmap_change_attr((vm_offset_t) sc->sram,
len, PAT_WRITE_COMBINING);
if (err == 0)
return;
else
device_printf(sc->dev, "pmap_change_attr failed, %d\n",
err);
#endif
pa = rman_get_start(sc->mem_res);
mrdesc.mr_base = pa;
mrdesc.mr_len = len;
mrdesc.mr_flags = MDF_WRITECOMBINE;