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authorDavid Mosberger-Tang <David.Mosberger@acm.org>2006-06-21 14:19:22 -0400
committerTony Luck <tony.luck@intel.com>2006-06-21 14:19:22 -0400
commit2ab561a116e16cdee3ae0e13d51910634c15aee9 (patch)
tree3a1ff4ae7546c57778a2cd4b51fb5d76aaaae93e
parent22ae813b85df7c0b0fc7c8d6f336d6a9f566ff97 (diff)
[IA64] esi-support
Add support for making ESI calls [1]. ESI stands for "Extensible SAL specification" and is basically a way for invoking firmware subroutines which are identified by a GUID. I don't know whether ESI is used by vendors other than HP (if you do, please let me know) but as firmware "backdoors" go, this seems one of the cleaner methods, so it seems reasonable to support it, even though I'm not aware of any publicly documented ESI calls. I'd have liked to make the ESI module completely stand-alone, but unfortunately that is not easily (or not at all) possible because in order to make ESI calls in physical mode, a small stub similar to the EFI stub is needed in the kernel proper. I did try to create a stub that would work in user-level, but it quickly got ugly beyond recognition (e.g., the stub had to make assumptions about how the module-loader generated call-stubs work) and I didn't even get it to work (that's probably fixable, but I didn't bother because I concluded it was too ugly anyhow). While it's not terribly elegant to have kernel code which isn't actively used in the kernel proper, I think it might be worth making an exception here for two reasons: the code is trivially small (all that's really needed is esi_stub.S) and by including it in the normal kernel distro, it might encourage other OEMs to also use ESI, which I think would be far better than each inventing their own firmware "backdoor". The code was originally written by Alex. I just massaged and packaged it a bit (and perhaps messed up some things along the way...). Changes since first version of patch that was posted to mailing list: * Export ia64_esi_call and ia64_esi_call_phys() as GPL symbols. * Disallow building esi.c as a module for now. Building as a module would currently lead to an unresolved reference to "sal_lock" on SMP kernels because that symbol doesn't get exported. * Export esi_call_phys() only if ESI is enabled. * Remove internal stuff from esi.h and add a "proc_type" argument to ia64_esi_call() such that serialization-requirements can be expressed (ESI follows SAL here, where procedure calls may have to be serialized, are MP-safe, or MP-safe andr reentrant). [1] h21007.www2.hp.com/dspp/tech/tech_TechDocumentDetailPage_IDX/1,1701,919,00.html Signed-off-by: David Mosberger <David.Mosberger@acm.org> Signed-off-by: Alex Williamson <alex.williamson@hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat
-rw-r--r--arch/ia64/Kconfig8
-rw-r--r--arch/ia64/kernel/Makefile5
-rw-r--r--arch/ia64/kernel/esi.c205
-rw-r--r--arch/ia64/kernel/esi_stub.S96
-rw-r--r--arch/ia64/kernel/ia64_ksyms.c4
-rw-r--r--include/asm-ia64/esi.h30
6 files changed, 348 insertions, 0 deletions
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 0f3076a820c3..bc106519482c 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -413,6 +413,14 @@ config IA64_PALINFO
413config SGI_SN 413config SGI_SN
414 def_bool y if (IA64_SGI_SN2 || IA64_GENERIC) 414 def_bool y if (IA64_SGI_SN2 || IA64_GENERIC)
415 415
416config IA64_ESI
417 bool "ESI (Extensible SAL Interface) support"
418 help
419 If you say Y here, support is built into the kernel to
420 make ESI calls. ESI calls are used to support vendor-specific
421 firmware extensions, such as the ability to inject memory-errors
422 for test-purposes. If you're unsure, say N.
423
416source "drivers/sn/Kconfig" 424source "drivers/sn/Kconfig"
417 425
418source "drivers/firmware/Kconfig" 426source "drivers/firmware/Kconfig"
diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index 09a0dbc17fb6..66ac8e3dca9c 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -31,6 +31,11 @@ obj-$(CONFIG_KPROBES) += kprobes.o jprobes.o
31obj-$(CONFIG_IA64_UNCACHED_ALLOCATOR) += uncached.o 31obj-$(CONFIG_IA64_UNCACHED_ALLOCATOR) += uncached.o
32mca_recovery-y += mca_drv.o mca_drv_asm.o 32mca_recovery-y += mca_drv.o mca_drv_asm.o
33 33
34obj-$(CONFIG_IA64_ESI) += esi.o
35ifneq ($(CONFIG_IA64_ESI),)
36obj-y += esi_stub.o # must be in kernel proper
37endif
38
34# The gate DSO image is built using a special linker script. 39# The gate DSO image is built using a special linker script.
35targets += gate.so gate-syms.o 40targets += gate.so gate-syms.o
36 41
diff --git a/arch/ia64/kernel/esi.c b/arch/ia64/kernel/esi.c
new file mode 100644
index 000000000000..ebf4e988e78c
--- /dev/null
+++ b/arch/ia64/kernel/esi.c
@@ -0,0 +1,205 @@
1/*
2 * Extensible SAL Interface (ESI) support routines.
3 *
4 * Copyright (C) 2006 Hewlett-Packard Co
5 * Alex Williamson <alex.williamson@hp.com>
6 */
7#include <linux/kernel.h>
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/string.h>
11
12#include <asm/esi.h>
13#include <asm/sal.h>
14
15MODULE_AUTHOR("Alex Williamson <alex.williamson@hp.com>");
16MODULE_DESCRIPTION("Extensible SAL Interface (ESI) support");
17MODULE_LICENSE("GPL");
18
19#define MODULE_NAME "esi"
20
21#define ESI_TABLE_GUID \
22 EFI_GUID(0x43EA58DC, 0xCF28, 0x4b06, 0xB3, \
23 0x91, 0xB7, 0x50, 0x59, 0x34, 0x2B, 0xD4)
24
25enum esi_systab_entry_type {
26 ESI_DESC_ENTRY_POINT = 0
27};
28
29/*
30 * Entry type: Size:
31 * 0 48
32 */
33#define ESI_DESC_SIZE(type) "\060"[(unsigned) (type)]
34
35typedef struct ia64_esi_desc_entry_point {
36 u8 type;
37 u8 reserved1[15];
38 u64 esi_proc;
39 u64 gp;
40 efi_guid_t guid;
41} ia64_esi_desc_entry_point_t;
42
43struct pdesc {
44 void *addr;
45 void *gp;
46};
47
48static struct ia64_sal_systab *esi_systab;
49
50static int __init esi_init (void)
51{
52 efi_config_table_t *config_tables;
53 struct ia64_sal_systab *systab;
54 unsigned long esi = 0;
55 char *p;
56 int i;
57
58 config_tables = __va(efi.systab->tables);
59
60 for (i = 0; i < (int) efi.systab->nr_tables; ++i) {
61 if (efi_guidcmp(config_tables[i].guid, ESI_TABLE_GUID) == 0) {
62 esi = config_tables[i].table;
63 break;
64 }
65 }
66
67 if (!esi)
68 return -ENODEV;;
69
70 systab = __va(esi);
71
72 if (strncmp(systab->signature, "ESIT", 4) != 0) {
73 printk(KERN_ERR "bad signature in ESI system table!");
74 return -ENODEV;
75 }
76
77 p = (char *) (systab + 1);
78 for (i = 0; i < systab->entry_count; i++) {
79 /*
80 * The first byte of each entry type contains the type
81 * descriptor.
82 */
83 switch (*p) {
84 case ESI_DESC_ENTRY_POINT:
85 break;
86 default:
87 printk(KERN_WARNING "Unkown table type %d found in "
88 "ESI table, ignoring rest of table\n", *p);
89 return -ENODEV;
90 }
91
92 p += ESI_DESC_SIZE(*p);
93 }
94
95 esi_systab = systab;
96 return 0;
97}
98
99
100int ia64_esi_call (efi_guid_t guid, struct ia64_sal_retval *isrvp,
101 enum esi_proc_type proc_type, u64 func,
102 u64 arg1, u64 arg2, u64 arg3, u64 arg4, u64 arg5, u64 arg6,
103 u64 arg7)
104{
105 struct ia64_fpreg fr[6];
106 unsigned long flags = 0;
107 int i;
108 char *p;
109
110 if (!esi_systab)
111 return -1;
112
113 p = (char *) (esi_systab + 1);
114 for (i = 0; i < esi_systab->entry_count; i++) {
115 if (*p == ESI_DESC_ENTRY_POINT) {
116 ia64_esi_desc_entry_point_t *esi = (void *)p;
117 if (!efi_guidcmp(guid, esi->guid)) {
118 ia64_sal_handler esi_proc;
119 struct pdesc pdesc;
120
121 pdesc.addr = __va(esi->esi_proc);
122 pdesc.gp = __va(esi->gp);
123
124 esi_proc = (ia64_sal_handler) &pdesc;
125
126 ia64_save_scratch_fpregs(fr);
127 if (proc_type == ESI_PROC_SERIALIZED)
128 spin_lock_irqsave(&sal_lock, flags);
129 else if (proc_type == ESI_PROC_MP_SAFE)
130 local_irq_save(flags);
131 else
132 preempt_disable();
133 *isrvp = (*esi_proc)(func, arg1, arg2, arg3,
134 arg4, arg5, arg6, arg7);
135 if (proc_type == ESI_PROC_SERIALIZED)
136 spin_unlock_irqrestore(&sal_lock,
137 flags);
138 else if (proc_type == ESI_PROC_MP_SAFE)
139 local_irq_restore(flags);
140 else
141 preempt_enable();
142 ia64_load_scratch_fpregs(fr);
143 return 0;
144 }
145 }
146 p += ESI_DESC_SIZE(*p);
147 }
148 return -1;
149}
150EXPORT_SYMBOL_GPL(ia64_esi_call);
151
152int ia64_esi_call_phys (efi_guid_t guid, struct ia64_sal_retval *isrvp,
153 u64 func, u64 arg1, u64 arg2, u64 arg3, u64 arg4,
154 u64 arg5, u64 arg6, u64 arg7)
155{
156 struct ia64_fpreg fr[6];
157 unsigned long flags;
158 u64 esi_params[8];
159 char *p;
160 int i;
161
162 if (!esi_systab)
163 return -1;
164
165 p = (char *) (esi_systab + 1);
166 for (i = 0; i < esi_systab->entry_count; i++) {
167 if (*p == ESI_DESC_ENTRY_POINT) {
168 ia64_esi_desc_entry_point_t *esi = (void *)p;
169 if (!efi_guidcmp(guid, esi->guid)) {
170 ia64_sal_handler esi_proc;
171 struct pdesc pdesc;
172
173 pdesc.addr = (void *)esi->esi_proc;
174 pdesc.gp = (void *)esi->gp;
175
176 esi_proc = (ia64_sal_handler) &pdesc;
177
178 esi_params[0] = func;
179 esi_params[1] = arg1;
180 esi_params[2] = arg2;
181 esi_params[3] = arg3;
182 esi_params[4] = arg4;
183 esi_params[5] = arg5;
184 esi_params[6] = arg6;
185 esi_params[7] = arg7;
186 ia64_save_scratch_fpregs(fr);
187 spin_lock_irqsave(&sal_lock, flags);
188 *isrvp = esi_call_phys(esi_proc, esi_params);
189 spin_unlock_irqrestore(&sal_lock, flags);
190 ia64_load_scratch_fpregs(fr);
191 return 0;
192 }
193 }
194 p += ESI_DESC_SIZE(*p);
195 }
196 return -1;
197}
198EXPORT_SYMBOL_GPL(ia64_esi_call_phys);
199
200static void __exit esi_exit (void)
201{
202}
203
204module_init(esi_init);
205module_exit(esi_exit); /* makes module removable... */
diff --git a/arch/ia64/kernel/esi_stub.S b/arch/ia64/kernel/esi_stub.S
new file mode 100644
index 000000000000..6b3d6c1f99b6
--- /dev/null
+++ b/arch/ia64/kernel/esi_stub.S
@@ -0,0 +1,96 @@
1/*
2 * ESI call stub.
3 *
4 * Copyright (C) 2005 Hewlett-Packard Co
5 * Alex Williamson <alex.williamson@hp.com>
6 *
7 * Based on EFI call stub by David Mosberger. The stub is virtually
8 * identical to the one for EFI phys-mode calls, except that ESI
9 * calls may have up to 8 arguments, so they get passed to this routine
10 * through memory.
11 *
12 * This stub allows us to make ESI calls in physical mode with interrupts
13 * turned off. ESI calls may not support calling from virtual mode.
14 *
15 * Google for "Extensible SAL specification" for a document describing the
16 * ESI standard.
17 */
18
19/*
20 * PSR settings as per SAL spec (Chapter 8 in the "IA-64 System
21 * Abstraction Layer Specification", revision 2.6e). Note that
22 * psr.dfl and psr.dfh MUST be cleared, despite what this manual says.
23 * Otherwise, SAL dies whenever it's trying to do an IA-32 BIOS call
24 * (the br.ia instruction fails unless psr.dfl and psr.dfh are
25 * cleared). Fortunately, SAL promises not to touch the floating
26 * point regs, so at least we don't have to save f2-f127.
27 */
28#define PSR_BITS_TO_CLEAR \
29 (IA64_PSR_I | IA64_PSR_IT | IA64_PSR_DT | IA64_PSR_RT | \
30 IA64_PSR_DD | IA64_PSR_SS | IA64_PSR_RI | IA64_PSR_ED | \
31 IA64_PSR_DFL | IA64_PSR_DFH)
32
33#define PSR_BITS_TO_SET \
34 (IA64_PSR_BN)
35
36#include <asm/processor.h>
37#include <asm/asmmacro.h>
38
39/*
40 * Inputs:
41 * in0 = address of function descriptor of ESI routine to call
42 * in1 = address of array of ESI parameters
43 *
44 * Outputs:
45 * r8 = result returned by called function
46 */
47GLOBAL_ENTRY(esi_call_phys)
48 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
49 alloc loc1=ar.pfs,2,7,8,0
50 ld8 r2=[in0],8 // load ESI function's entry point
51 mov loc0=rp
52 .body
53 ;;
54 ld8 out0=[in1],8 // ESI params loaded from array
55 ;; // passing all as inputs doesn't work
56 ld8 out1=[in1],8
57 ;;
58 ld8 out2=[in1],8
59 ;;
60 ld8 out3=[in1],8
61 ;;
62 ld8 out4=[in1],8
63 ;;
64 ld8 out5=[in1],8
65 ;;
66 ld8 out6=[in1],8
67 ;;
68 ld8 out7=[in1]
69 mov loc2=gp // save global pointer
70 mov loc4=ar.rsc // save RSE configuration
71 mov ar.rsc=0 // put RSE in enforced lazy, LE mode
72 ;;
73 ld8 gp=[in0] // load ESI function's global pointer
74 movl r16=PSR_BITS_TO_CLEAR
75 mov loc3=psr // save processor status word
76 movl r17=PSR_BITS_TO_SET
77 ;;
78 or loc3=loc3,r17
79 mov b6=r2
80 ;;
81 andcm r16=loc3,r16 // get psr with IT, DT, and RT bits cleared
82 br.call.sptk.many rp=ia64_switch_mode_phys
83.ret0: mov loc5=r19 // old ar.bsp
84 mov loc6=r20 // old sp
85 br.call.sptk.many rp=b6 // call the ESI function
86.ret1: mov ar.rsc=0 // put RSE in enforced lazy, LE mode
87 mov r16=loc3 // save virtual mode psr
88 mov r19=loc5 // save virtual mode bspstore
89 mov r20=loc6 // save virtual mode sp
90 br.call.sptk.many rp=ia64_switch_mode_virt // return to virtual mode
91.ret2: mov ar.rsc=loc4 // restore RSE configuration
92 mov ar.pfs=loc1
93 mov rp=loc0
94 mov gp=loc2
95 br.ret.sptk.many rp
96END(esi_call_phys)
diff --git a/arch/ia64/kernel/ia64_ksyms.c b/arch/ia64/kernel/ia64_ksyms.c
index bbcfd08378a6..9583f310d486 100644
--- a/arch/ia64/kernel/ia64_ksyms.c
+++ b/arch/ia64/kernel/ia64_ksyms.c
@@ -106,5 +106,9 @@ EXPORT_SYMBOL(ia64_spinlock_contention);
106# endif 106# endif
107#endif 107#endif
108 108
109#if defined(CONFIG_IA64_ESI) || defined(CONFIG_IA64_ESI_MODULE)
110extern void esi_call_phys (void);
111EXPORT_SYMBOL_GPL(esi_call_phys);
112#endif
109extern char ia64_ivt[]; 113extern char ia64_ivt[];
110EXPORT_SYMBOL(ia64_ivt); 114EXPORT_SYMBOL(ia64_ivt);
diff --git a/include/asm-ia64/esi.h b/include/asm-ia64/esi.h
new file mode 100644
index 000000000000..84aac0e0b583
--- /dev/null
+++ b/include/asm-ia64/esi.h
@@ -0,0 +1,30 @@
1/*
2 * ESI service calls.
3 *
4 * Copyright (c) Copyright 2005-2006 Hewlett-Packard Development Company, L.P.
5 * Alex Williamson <alex.williamson@hp.com>
6 */
7#ifndef esi_h
8#define esi_h
9
10#include <linux/efi.h>
11
12#define ESI_QUERY 0x00000001
13#define ESI_OPEN_HANDLE 0x02000000
14#define ESI_CLOSE_HANDLE 0x02000001
15
16enum esi_proc_type {
17 ESI_PROC_SERIALIZED, /* calls need to be serialized */
18 ESI_PROC_MP_SAFE, /* MP-safe, but not reentrant */
19 ESI_PROC_REENTRANT /* MP-safe and reentrant */
20};
21
22extern int ia64_esi_init (void);
23extern struct ia64_sal_retval esi_call_phys (void *, u64 *);
24extern int ia64_esi_call(efi_guid_t, struct ia64_sal_retval *,
25 enum esi_proc_type,
26 u64, u64, u64, u64, u64, u64, u64, u64);
27extern int ia64_esi_call_phys(efi_guid_t, struct ia64_sal_retval *, u64, u64,
28 u64, u64, u64, u64, u64, u64);
29
30#endif /* esi_h */
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