diff options
| author | Robin Holt <holt@sgi.com> | 2009-12-15 16:47:55 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-16 07:20:13 -0800 |
| commit | 289750d1f1fd4a715baa2a2c6dd0cec2b8317fd7 (patch) | |
| tree | 2c525297c460a9ab98b9649eb3021e534a8e77fd /drivers/misc/sgi-gru/grukservices.c | |
| parent | fae419f2abd15ab7d1cd1413e6683a276a4e14e2 (diff) | |
X86: uv: implement a gru_read_gpa kernel function
The BIOS has decided to store a pointer to the partition reserved page in
a scratch MMR. The GRU is only able to read an MMR using a vload
instruction. The gru_read_gpa() function will implemented.
Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Jack Steiner <steiner@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/misc/sgi-gru/grukservices.c')
| -rw-r--r-- | drivers/misc/sgi-gru/grukservices.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/misc/sgi-gru/grukservices.c b/drivers/misc/sgi-gru/grukservices.c index 766e21e1557..d2b149facda 100644 --- a/drivers/misc/sgi-gru/grukservices.c +++ b/drivers/misc/sgi-gru/grukservices.c @@ -858,6 +858,29 @@ EXPORT_SYMBOL_GPL(gru_get_next_message); /* ---------------------- GRU DATA COPY FUNCTIONS ---------------------------*/ /* + * Load a DW from a global GPA. The GPA can be a memory or MMR address. + */ +int gru_read_gpa(unsigned long *value, unsigned long gpa) +{ + void *cb; + void *dsr; + int ret, iaa; + + STAT(read_gpa); + if (gru_get_cpu_resources(GRU_NUM_KERNEL_DSR_BYTES, &cb, &dsr)) + return MQE_BUG_NO_RESOURCES; + iaa = gpa >> 62; + gru_vload_phys(cb, gpa, gru_get_tri(dsr), iaa, IMA); + ret = gru_wait(cb); + if (ret == CBS_IDLE) + *value = *(unsigned long *)dsr; + gru_free_cpu_resources(cb, dsr); + return ret; +} +EXPORT_SYMBOL_GPL(gru_read_gpa); + + +/* * Copy a block of data using the GRU resources */ int gru_copy_gpa(unsigned long dest_gpa, unsigned long src_gpa, |