| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Thu, 10 Feb 2011 18:15:10 +0100
From: Borislav Petkov <bp@...64.org>
To: <linux-edac@...r.kernel.org>
Cc: <linux-kernel@...r.kernel.org>,
Borislav Petkov <borislav.petkov@....com>
Subject: [PATCH 07/30] amd64_edac: Sanitize f10_get_base_addr_offset
From: Borislav Petkov <borislav.petkov@....com>
This function maps the system address to the normalized DCT address.
Document what the code does for more clarity and wrap insane bitmasks in
a more understandable macro which generates them. Also, reduce number of
arguments passed to the function. Finally, rename this function to what
it actually does.
No functional change.
Signed-off-by: Borislav Petkov <borislav.petkov@....com>
---
drivers/edac/amd64_edac.c | 83 ++++++++++++++++++++++++--------------------
drivers/edac/amd64_edac.h | 15 +++-----
2 files changed, 50 insertions(+), 48 deletions(-)
diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index d9e951c..32e3231 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -460,13 +460,12 @@ int amd64_get_dram_hole_info(struct mem_ctl_info *mci, u64 *hole_base,
}
/* valid for Fam10h and above */
- if (boot_cpu_data.x86 >= 0x10 &&
- (pvt->dhar & DRAM_MEM_HOIST_VALID) == 0) {
+ if (boot_cpu_data.x86 >= 0x10 && !dhar_mem_hoist_valid(pvt)) {
debugf1(" Dram Memory Hoisting is DISABLED on this system\n");
return 1;
}
- if ((pvt->dhar & DHAR_VALID) == 0) {
+ if (!dhar_valid(pvt)) {
debugf1(" Dram Memory Hoisting is DISABLED on this node %d\n",
pvt->mc_node_id);
return 1;
@@ -859,8 +858,7 @@ static void dump_misc_regs(struct amd64_pvt *pvt)
(boot_cpu_data.x86 == 0xf) ? k8_dhar_offset(pvt)
: f10_dhar_offset(pvt));
- debugf1(" DramHoleValid: %s\n",
- (pvt->dhar & DHAR_VALID) ? "yes" : "no");
+ debugf1(" DramHoleValid: %s\n", dhar_valid(pvt) ? "yes" : "no");
amd64_debug_display_dimm_sizes(0, pvt);
@@ -1238,30 +1236,53 @@ static u8 f10_determine_channel(struct amd64_pvt *pvt, u64 sys_addr,
return 0;
}
-/* See F10h BKDG, 2.8.10.2 DctSelBaseOffset Programming */
-static inline u64 f10_get_base_addr_offset(u64 sys_addr, bool hi_range_sel,
- u32 dct_sel_base_addr,
- u64 dct_sel_base_off,
- u32 hole_valid, u64 hole_off,
- u64 dram_base)
+/* Convert the sys_addr to the normalized DCT address */
+static u64 f10_get_norm_dct_addr(struct amd64_pvt *pvt, int range,
+ u64 sys_addr, bool hi_rng,
+ u32 dct_sel_base_addr)
{
u64 chan_off;
+ u64 dram_base = get_dram_base(pvt, range);
+ u64 hole_off = f10_dhar_offset(pvt);
+ u32 hole_valid = dhar_valid(pvt);
+ u64 dct_sel_base_off = (pvt->dct_sel_hi & 0xFFFFFC00) << 16;
- if (hi_range_sel) {
- if (!(dct_sel_base_addr & 0xFFFF0000) &&
- hole_valid && (sys_addr >= 0x100000000ULL))
+ if (hi_rng) {
+ /*
+ * if
+ * base address of high range is below 4Gb
+ * (bits [47:27] at [31:11])
+ * DRAM address space on this DCT is hoisted above 4Gb &&
+ * sys_addr > 4Gb
+ *
+ * remove hole offset from sys_addr
+ * else
+ * remove high range offset from sys_addr
+ */
+ if ((!(dct_sel_base_addr >> 16) ||
+ dct_sel_base_addr < dhar_base(pvt)) &&
+ hole_valid &&
+ (sys_addr >= BIT_64(32)))
chan_off = hole_off;
else
chan_off = dct_sel_base_off;
} else {
- if (hole_valid && (sys_addr >= 0x100000000ULL))
+ /*
+ * if
+ * we have a valid hole &&
+ * sys_addr > 4Gb
+ *
+ * remove hole
+ * else
+ * remove dram base to normalize to DCT address
+ */
+ if (hole_valid && (sys_addr >= BIT_64(32)))
chan_off = hole_off;
else
- chan_off = dram_base & 0xFFFFF8000000ULL;
+ chan_off = dram_base;
}
- return (sys_addr & 0x0000FFFFFFFFFFC0ULL) -
- (chan_off & 0x0000FFFFFF800000ULL);
+ return (sys_addr & GENMASK(6,47)) - (chan_off & GENMASK(23,47));
}
/* Hack for the time being - Can we get this from BIOS?? */
@@ -1346,30 +1367,17 @@ static int f10_match_to_this_node(struct amd64_pvt *pvt, int range,
u64 sys_addr, int *nid, int *chan_sel)
{
int cs_found = -EINVAL;
- u64 chan_addr, dct_sel_base_off;
- u64 hole_off;
- u32 hole_valid, tmp, dct_sel_base;
+ u64 chan_addr;
+ u32 tmp, dct_sel_base;
u8 channel;
bool high_range = false;
u8 node_id = dram_dst_node(pvt, range);
u8 intlv_en = dram_intlv_en(pvt, range);
u32 intlv_sel = dram_intlv_sel(pvt, range);
- u64 dram_base = get_dram_base(pvt, range);
-
- debugf1("(range %d) Base=0x%llx SystemAddr= 0x%llx Limit=0x%llx\n",
- range, dram_base, sys_addr, get_dram_limit(pvt, range));
-
- /*
- * This assumes that one node's DHAR is the same as all the other
- * nodes' DHAR.
- */
- hole_off = f10_dhar_offset(pvt);
- hole_valid = (pvt->dhar & DHAR_VALID);
- dct_sel_base_off = (pvt->dct_sel_hi & 0xFFFFFC00) << 16;
- debugf1(" HoleOffset=0x%016llx HoleValid=%d IntlvSel=0x%x\n",
- hole_off, hole_valid, intlv_sel);
+ debugf1("(range %d) SystemAddr= 0x%llx Limit=0x%llx\n",
+ range, sys_addr, get_dram_limit(pvt, range));
if (intlv_en &&
(intlv_sel != ((sys_addr >> 12) & intlv_en)))
@@ -1388,9 +1396,8 @@ static int f10_match_to_this_node(struct amd64_pvt *pvt, int range,
channel = f10_determine_channel(pvt, sys_addr, high_range, intlv_en);
- chan_addr = f10_get_base_addr_offset(sys_addr, high_range, dct_sel_base,
- dct_sel_base_off, hole_valid,
- hole_off, dram_base);
+ chan_addr = f10_get_norm_dct_addr(pvt, range, sys_addr,
+ high_range, dct_sel_base);
/* remove Node ID (in case of memory interleaving) */
tmp = chan_addr & 0xFC0;
diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index 1964f89..ba18183 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -184,18 +184,13 @@
#define dram_dst_node(pvt, i) (pvt->ranges[i].lim.lo & 0x7)
#define DHAR 0xf0
-#define DHAR_VALID BIT(0)
-#define DRAM_MEM_HOIST_VALID BIT(1)
+#define dhar_valid(pvt) ((pvt)->dhar & BIT(0))
+#define dhar_mem_hoist_valid(pvt) ((pvt)->dhar & BIT(1))
+#define dhar_base(pvt) ((pvt)->dhar & 0xff000000)
+#define k8_dhar_offset(pvt) (((pvt)->dhar & 0x0000ff00) << 16)
-#define DHAR_BASE_MASK 0xff000000
-#define dhar_base(pvt) ((pvt)->dhar & DHAR_BASE_MASK)
-
-#define K8_DHAR_OFFSET_MASK 0x0000ff00
-#define k8_dhar_offset(pvt) (((pvt)->dhar & K8_DHAR_OFFSET_MASK) << 16)
-
-#define F10_DHAR_OFFSET_MASK 0x0000ff80
/* NOTE: Extra mask bit vs K8 */
-#define f10_dhar_offset(pvt) (((pvt)->dhar & F10_DHAR_OFFSET_MASK) << 16)
+#define f10_dhar_offset(pvt) (((pvt)->dhar & 0x0000ff80) << 16)
#define DCT_CFG_SEL 0x10C
--
1.7.4.rc2
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists