From 289750d1f1fd4a715baa2a2c6dd0cec2b8317fd7 Mon Sep 17 00:00:00 2001 From: Robin Holt Date: Tue, 15 Dec 2009 16:47:55 -0800 Subject: 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 Signed-off-by: Jack Steiner Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/misc/sgi-gru/grukservices.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'drivers/misc/sgi-gru/grukservices.c') diff --git a/drivers/misc/sgi-gru/grukservices.c b/drivers/misc/sgi-gru/grukservices.c index 766e21e15574..d2b149facda1 100644 --- a/drivers/misc/sgi-gru/grukservices.c +++ b/drivers/misc/sgi-gru/grukservices.c @@ -857,6 +857,29 @@ 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 */ -- cgit _maps.c?id=e42da4c62abb547d9c9138e0e7fcd1f36057b5e8'>treecommitdiff
path: root/tools/testing/selftests/bpf/test_maps.c
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