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authorHeiko Carstens <heiko.carstens@de.ibm.com>2008-04-30 07:38:45 -0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-04-30 07:38:47 -0400
commit2e5061e40af88070984e3769eafb5a06022375fd (patch)
tree2964cc88a68f826fc8e025d145f692e1e78740e0 /arch/s390/kernel
parent8fc63658681f32e6e29f6d1138de933d7272e0ec (diff)
[S390] Convert machine feature detection code to C.
From: Heiko Carstens <heiko.carstens@de.ibm.com> From: Carsten Otte <cotte@de.ibm.com> This lets us use defines for the magic bits in machine flags instead of using plain numbers all over the place. In addition on newer machines features/facilities are indicated by the result of the stfl instruction. So we use these bits instead of trying to execute new instructions and check wether we get an exception or not. Also the mvpg instruction is always available when in zArch mode, whereas the idte instruction is only available in zArch mode. This results in some minor optimizations. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Carsten Otte <cotte@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/early.c109
-rw-r--r--arch/s390/kernel/head31.S61
-rw-r--r--arch/s390/kernel/head64.S62
-rw-r--r--arch/s390/kernel/setup.c2
4 files changed, 107 insertions, 127 deletions
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 68ec4083bf73..bd188f6bd0e2 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -139,15 +139,15 @@ static noinline __init void detect_machine_type(void)
139 139
140 /* Running under z/VM ? */ 140 /* Running under z/VM ? */
141 if (cpuinfo->cpu_id.version == 0xff) 141 if (cpuinfo->cpu_id.version == 0xff)
142 machine_flags |= 1; 142 machine_flags |= MACHINE_FLAG_VM;
143 143
144 /* Running on a P/390 ? */ 144 /* Running on a P/390 ? */
145 if (cpuinfo->cpu_id.machine == 0x7490) 145 if (cpuinfo->cpu_id.machine == 0x7490)
146 machine_flags |= 4; 146 machine_flags |= MACHINE_FLAG_P390;
147 147
148 /* Running under KVM ? */ 148 /* Running under KVM ? */
149 if (cpuinfo->cpu_id.version == 0xfe) 149 if (cpuinfo->cpu_id.version == 0xfe)
150 machine_flags |= 64; 150 machine_flags |= MACHINE_FLAG_KVM;
151} 151}
152 152
153#ifdef CONFIG_64BIT 153#ifdef CONFIG_64BIT
@@ -268,6 +268,103 @@ static noinline __init void setup_lowcore_early(void)
268 s390_base_pgm_handler_fn = early_pgm_check_handler; 268 s390_base_pgm_handler_fn = early_pgm_check_handler;
269} 269}
270 270
271static __init void detect_mvpg(void)
272{
273#ifndef CONFIG_64BIT
274 int rc;
275
276 asm volatile(
277 " la 0,0\n"
278 " mvpg %2,%2\n"
279 "0: la %0,0\n"
280 "1:\n"
281 EX_TABLE(0b,1b)
282 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
283 if (!rc)
284 machine_flags |= MACHINE_FLAG_MVPG;
285#endif
286}
287
288static __init void detect_ieee(void)
289{
290#ifndef CONFIG_64BIT
291 int rc, tmp;
292
293 asm volatile(
294 " efpc %1,0\n"
295 "0: la %0,0\n"
296 "1:\n"
297 EX_TABLE(0b,1b)
298 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
299 if (!rc)
300 machine_flags |= MACHINE_FLAG_IEEE;
301#endif
302}
303
304static __init void detect_csp(void)
305{
306#ifndef CONFIG_64BIT
307 int rc;
308
309 asm volatile(
310 " la 0,0\n"
311 " la 1,0\n"
312 " la 2,4\n"
313 " csp 0,2\n"
314 "0: la %0,0\n"
315 "1:\n"
316 EX_TABLE(0b,1b)
317 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
318 if (!rc)
319 machine_flags |= MACHINE_FLAG_CSP;
320#endif
321}
322
323static __init void detect_diag9c(void)
324{
325 unsigned int cpu_address;
326 int rc;
327
328 cpu_address = stap();
329 asm volatile(
330 " diag %2,0,0x9c\n"
331 "0: la %0,0\n"
332 "1:\n"
333 EX_TABLE(0b,1b)
334 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
335 if (!rc)
336 machine_flags |= MACHINE_FLAG_DIAG9C;
337}
338
339static __init void detect_diag44(void)
340{
341#ifdef CONFIG_64BIT
342 int rc;
343
344 asm volatile(
345 " diag 0,0,0x44\n"
346 "0: la %0,0\n"
347 "1:\n"
348 EX_TABLE(0b,1b)
349 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
350 if (!rc)
351 machine_flags |= MACHINE_FLAG_DIAG44;
352#endif
353}
354
355static __init void detect_machine_facilities(void)
356{
357#ifdef CONFIG_64BIT
358 unsigned int facilities;
359
360 facilities = stfl();
361 if (facilities & (1 << 28))
362 machine_flags |= MACHINE_FLAG_IDTE;
363 if (facilities & (1 << 4))
364 machine_flags |= MACHINE_FLAG_MVCOS;
365#endif
366}
367
271/* 368/*
272 * Save ipl parameters, clear bss memory, initialize storage keys 369 * Save ipl parameters, clear bss memory, initialize storage keys
273 * and create a kernel NSS at startup if the SAVESYS= parm is defined 370 * and create a kernel NSS at startup if the SAVESYS= parm is defined
@@ -285,6 +382,12 @@ void __init startup_init(void)
285 create_kernel_nss(); 382 create_kernel_nss();
286 sort_main_extable(); 383 sort_main_extable();
287 setup_lowcore_early(); 384 setup_lowcore_early();
385 detect_mvpg();
386 detect_ieee();
387 detect_csp();
388 detect_diag9c();
389 detect_diag44();
390 detect_machine_facilities();
288 sclp_read_info_early(); 391 sclp_read_info_early();
289 sclp_facilities_detect(); 392 sclp_facilities_detect();
290 memsize = sclp_memory_detect(); 393 memsize = sclp_memory_detect();
diff --git a/arch/s390/kernel/head31.S b/arch/s390/kernel/head31.S
index dc364c1419af..a816e2de32b9 100644
--- a/arch/s390/kernel/head31.S
+++ b/arch/s390/kernel/head31.S
@@ -57,61 +57,6 @@ startup_continue:
57# 57#
58 l %r14,.Lstartup_init-.LPG1(%r13) 58 l %r14,.Lstartup_init-.LPG1(%r13)
59 basr %r14,%r14 59 basr %r14,%r14
60
61 l %r12,.Lmflags-.LPG1(%r13) # get address of machine_flags
62#
63# find out if we have an IEEE fpu
64#
65 mvc __LC_PGM_NEW_PSW(8),.Lpcfpu-.LPG1(%r13)
66 efpc %r0,0 # test IEEE extract fpc instruction
67 oi 3(%r12),2 # set IEEE fpu flag
68.Lchkfpu:
69
70#
71# find out if we have the CSP instruction
72#
73 mvc __LC_PGM_NEW_PSW(8),.Lpccsp-.LPG1(%r13)
74 la %r0,0
75 lr %r1,%r0
76 la %r2,4
77 csp %r0,%r2 # Test CSP instruction
78 oi 3(%r12),8 # set CSP flag
79.Lchkcsp:
80
81#
82# find out if we have the MVPG instruction
83#
84 mvc __LC_PGM_NEW_PSW(8),.Lpcmvpg-.LPG1(%r13)
85 sr %r0,%r0
86 la %r1,0
87 la %r2,0
88 mvpg %r1,%r2 # Test CSP instruction
89 oi 3(%r12),16 # set MVPG flag
90.Lchkmvpg:
91
92#
93# find out if we have the IDTE instruction
94#
95 mvc __LC_PGM_NEW_PSW(8),.Lpcidte-.LPG1(%r13)
96 .long 0xb2b10000 # store facility list
97 tm 0xc8,0x08 # check bit for clearing-by-ASCE
98 bno .Lchkidte-.LPG1(%r13)
99 lhi %r1,2094
100 lhi %r2,0
101 .long 0xb98e2001
102 oi 3(%r12),0x80 # set IDTE flag
103.Lchkidte:
104
105#
106# find out if the diag 0x9c is available
107#
108 mvc __LC_PGM_NEW_PSW(8),.Lpcdiag9c-.LPG1(%r13)
109 stap __LC_CPUID+4 # store cpu address
110 lh %r1,__LC_CPUID+4
111 diag %r1,0,0x9c # test diag 0x9c
112 oi 2(%r12),1 # set diag9c flag
113.Lchkdiag9c:
114
115 lpsw .Lentry-.LPG1(13) # jump to _stext in primary-space, 60 lpsw .Lentry-.LPG1(13) # jump to _stext in primary-space,
116 # virtual and never return ... 61 # virtual and never return ...
117 .align 8 62 .align 8
@@ -132,13 +77,7 @@ startup_continue:
132 .long 0 # cr13: home space segment table 77 .long 0 # cr13: home space segment table
133 .long 0xc0000000 # cr14: machine check handling off 78 .long 0xc0000000 # cr14: machine check handling off
134 .long 0 # cr15: linkage stack operations 79 .long 0 # cr15: linkage stack operations
135.Lpcfpu:.long 0x00080000,0x80000000 + .Lchkfpu
136.Lpccsp:.long 0x00080000,0x80000000 + .Lchkcsp
137.Lpcmvpg:.long 0x00080000,0x80000000 + .Lchkmvpg
138.Lpcidte:.long 0x00080000,0x80000000 + .Lchkidte
139.Lpcdiag9c:.long 0x00080000,0x80000000 + .Lchkdiag9c
140.Lmchunk:.long memory_chunk 80.Lmchunk:.long memory_chunk
141.Lmflags:.long machine_flags
142.Lbss_bgn: .long __bss_start 81.Lbss_bgn: .long __bss_start
143.Lbss_end: .long _end 82.Lbss_end: .long _end
144.Lparmaddr: .long PARMAREA 83.Lparmaddr: .long PARMAREA
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 79dccd206a6e..9c2c6f7d37e7 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -125,68 +125,6 @@ startup_continue:
125# and create a kernel NSS if the SAVESYS= parm is defined 125# and create a kernel NSS if the SAVESYS= parm is defined
126# 126#
127 brasl %r14,startup_init 127 brasl %r14,startup_init
128 # set program check new psw mask
129 mvc __LC_PGM_NEW_PSW(8),.Lpcmsk-.LPG1(%r13)
130 larl %r12,machine_flags
131#
132# find out if we have the MVPG instruction
133#
134 la %r1,0f-.LPG1(%r13) # set program check address
135 stg %r1,__LC_PGM_NEW_PSW+8
136 sgr %r0,%r0
137 lghi %r1,0
138 lghi %r2,0
139 mvpg %r1,%r2 # test MVPG instruction
140 oi 7(%r12),16 # set MVPG flag
1410:
142
143#
144# find out if the diag 0x44 works in 64 bit mode
145#
146 la %r1,0f-.LPG1(%r13) # set program check address
147 stg %r1,__LC_PGM_NEW_PSW+8
148 diag 0,0,0x44 # test diag 0x44
149 oi 7(%r12),32 # set diag44 flag
1500:
151
152#
153# find out if we have the IDTE instruction
154#
155 la %r1,0f-.LPG1(%r13) # set program check address
156 stg %r1,__LC_PGM_NEW_PSW+8
157 .long 0xb2b10000 # store facility list
158 tm 0xc8,0x08 # check bit for clearing-by-ASCE
159 bno 0f-.LPG1(%r13)
160 lhi %r1,2048
161 lhi %r2,0
162 .long 0xb98e2001
163 oi 7(%r12),0x80 # set IDTE flag
1640:
165
166#
167# find out if the diag 0x9c is available
168#
169 la %r1,0f-.LPG1(%r13) # set program check address
170 stg %r1,__LC_PGM_NEW_PSW+8
171 stap __LC_CPUID+4 # store cpu address
172 lh %r1,__LC_CPUID+4
173 diag %r1,0,0x9c # test diag 0x9c
174 oi 6(%r12),1 # set diag9c flag
1750:
176
177#
178# find out if we have the MVCOS instruction
179#
180 la %r1,0f-.LPG1(%r13) # set program check address
181 stg %r1,__LC_PGM_NEW_PSW+8
182 .short 0xc800 # mvcos 0(%r0),0(%r0),%r0
183 .short 0x0000
184 .short 0x0000
1850: tm 0x8f,0x13 # special-operation exception?
186 bno 1f-.LPG1(%r13) # if yes, MVCOS is present
187 oi 6(%r12),2 # set MVCOS flag
1881:
189
190 lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space, 128 lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space,
191 # virtual and never return ... 129 # virtual and never return ...
192 .align 16 130 .align 16
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 024180e25e85..694c6546ce64 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -73,7 +73,7 @@ EXPORT_SYMBOL(uaccess);
73unsigned int console_mode = 0; 73unsigned int console_mode = 0;
74unsigned int console_devno = -1; 74unsigned int console_devno = -1;
75unsigned int console_irq = -1; 75unsigned int console_irq = -1;
76unsigned long machine_flags = 0; 76unsigned long machine_flags;
77unsigned long elf_hwcap = 0; 77unsigned long elf_hwcap = 0;
78char elf_platform[ELF_PLATFORM_SIZE]; 78char elf_platform[ELF_PLATFORM_SIZE];
79 79
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