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-rw-r--r--arch/s390/kernel/Makefile2
-rw-r--r--arch/s390/kernel/early.c109
-rw-r--r--arch/s390/kernel/mem_detect.c100
-rw-r--r--arch/s390/kernel/setup.c2
4 files changed, 103 insertions, 110 deletions
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 0fed81d91e03..50f657e77344 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -14,7 +14,7 @@ CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'
14 14
15obj-y := bitmap.o traps.o time.o process.o base.o early.o \ 15obj-y := bitmap.o traps.o time.o process.o base.o early.o \
16 setup.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o \ 16 setup.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o \
17 s390_ext.o debug.o irq.o ipl.o dis.o diag.o 17 s390_ext.o debug.o irq.o ipl.o dis.o diag.o mem_detect.o
18 18
19obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o) 19obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o)
20obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o) 20obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o)
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index e22473993dc9..4c0ec7b46e37 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -192,100 +192,6 @@ static noinline __init void detect_machine_type(void)
192 machine_flags |= MACHINE_FLAG_KVM; 192 machine_flags |= MACHINE_FLAG_KVM;
193} 193}
194 194
195#ifdef CONFIG_64BIT
196static noinline __init int memory_fast_detect(void)
197{
198 unsigned long val0 = 0;
199 unsigned long val1 = 0xc;
200 int ret = -ENOSYS;
201
202 if (ipl_flags & IPL_NSS_VALID)
203 return -ENOSYS;
204
205 asm volatile(
206 " diag %1,%2,0x260\n"
207 "0: lhi %0,0\n"
208 "1:\n"
209 EX_TABLE(0b,1b)
210 : "+d" (ret), "+d" (val0), "+d" (val1) : : "cc");
211
212 if (ret || val0 != val1)
213 return -ENOSYS;
214
215 memory_chunk[0].size = val0 + 1;
216 return 0;
217}
218#else
219static inline int memory_fast_detect(void)
220{
221 return -ENOSYS;
222}
223#endif
224
225static inline __init unsigned long __tprot(unsigned long addr)
226{
227 int cc = -1;
228
229 asm volatile(
230 " tprot 0(%1),0\n"
231 "0: ipm %0\n"
232 " srl %0,28\n"
233 "1:\n"
234 EX_TABLE(0b,1b)
235 : "+d" (cc) : "a" (addr) : "cc");
236 return (unsigned long)cc;
237}
238
239/* Checking memory in 128KB increments. */
240#define CHUNK_INCR (1UL << 17)
241#define ADDR2G (1UL << 31)
242
243static noinline __init void find_memory_chunks(unsigned long memsize)
244{
245 unsigned long addr = 0, old_addr = 0;
246 unsigned long old_cc = CHUNK_READ_WRITE;
247 unsigned long cc;
248 int chunk = 0;
249
250 while (chunk < MEMORY_CHUNKS) {
251 cc = __tprot(addr);
252 while (cc == old_cc) {
253 addr += CHUNK_INCR;
254 if (memsize && addr >= memsize)
255 break;
256#ifndef CONFIG_64BIT
257 if (addr == ADDR2G)
258 break;
259#endif
260 cc = __tprot(addr);
261 }
262
263 if (old_addr != addr &&
264 (old_cc == CHUNK_READ_WRITE || old_cc == CHUNK_READ_ONLY)) {
265 memory_chunk[chunk].addr = old_addr;
266 memory_chunk[chunk].size = addr - old_addr;
267 memory_chunk[chunk].type = old_cc;
268 chunk++;
269 }
270
271 old_addr = addr;
272 old_cc = cc;
273
274#ifndef CONFIG_64BIT
275 if (addr == ADDR2G)
276 break;
277#endif
278 /*
279 * Finish memory detection at the first hole
280 * if storage size is unknown.
281 */
282 if (cc == -1UL && !memsize)
283 break;
284 if (memsize && addr >= memsize)
285 break;
286 }
287}
288
289static __init void early_pgm_check_handler(void) 195static __init void early_pgm_check_handler(void)
290{ 196{
291 unsigned long addr; 197 unsigned long addr;
@@ -465,8 +371,6 @@ static void __init setup_boot_command_line(void)
465 */ 371 */
466void __init startup_init(void) 372void __init startup_init(void)
467{ 373{
468 unsigned long long memsize;
469
470 ipl_save_parameters(); 374 ipl_save_parameters();
471 rescue_initrd(); 375 rescue_initrd();
472 clear_bss_section(); 376 clear_bss_section();
@@ -486,18 +390,7 @@ void __init startup_init(void)
486 detect_diag44(); 390 detect_diag44();
487 detect_machine_facilities(); 391 detect_machine_facilities();
488 setup_hpage(); 392 setup_hpage();
489 sclp_read_info_early();
490 sclp_facilities_detect(); 393 sclp_facilities_detect();
491 memsize = sclp_memory_detect(); 394 detect_memory_layout(memory_chunk);
492#ifndef CONFIG_64BIT
493 /*
494 * Can't deal with more than 2G in 31 bit addressing mode, so
495 * limit the value in order to avoid strange side effects.
496 */
497 if (memsize > ADDR2G)
498 memsize = ADDR2G;
499#endif
500 if (memory_fast_detect() < 0)
501 find_memory_chunks((unsigned long) memsize);
502 lockdep_on(); 395 lockdep_on();
503} 396}
diff --git a/arch/s390/kernel/mem_detect.c b/arch/s390/kernel/mem_detect.c
new file mode 100644
index 000000000000..18ed7abe16c5
--- /dev/null
+++ b/arch/s390/kernel/mem_detect.c
@@ -0,0 +1,100 @@
1/*
2 * Copyright IBM Corp. 2008
3 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
4 */
5
6#include <linux/kernel.h>
7#include <linux/module.h>
8#include <asm/ipl.h>
9#include <asm/sclp.h>
10#include <asm/setup.h>
11
12static int memory_fast_detect(struct mem_chunk *chunk)
13{
14 unsigned long val0 = 0;
15 unsigned long val1 = 0xc;
16 int rc = -EOPNOTSUPP;
17
18 if (ipl_flags & IPL_NSS_VALID)
19 return -EOPNOTSUPP;
20 asm volatile(
21 " diag %1,%2,0x260\n"
22 "0: lhi %0,0\n"
23 "1:\n"
24 EX_TABLE(0b,1b)
25 : "+d" (rc), "+d" (val0), "+d" (val1) : : "cc");
26
27 if (rc || val0 != val1)
28 return -EOPNOTSUPP;
29 chunk->size = val0 + 1;
30 return 0;
31}
32
33static inline int tprot(unsigned long addr)
34{
35 int rc = -EFAULT;
36
37 asm volatile(
38 " tprot 0(%1),0\n"
39 "0: ipm %0\n"
40 " srl %0,28\n"
41 "1:\n"
42 EX_TABLE(0b,1b)
43 : "+d" (rc) : "a" (addr) : "cc");
44 return rc;
45}
46
47#define ADDR2G (1ULL << 31)
48
49static void find_memory_chunks(struct mem_chunk chunk[])
50{
51 unsigned long long memsize, rnmax, rzm;
52 unsigned long addr = 0, size;
53 int i = 0, type;
54
55 rzm = sclp_get_rzm();
56 rnmax = sclp_get_rnmax();
57 memsize = rzm * rnmax;
58 if (!rzm)
59 rzm = 1ULL << 17;
60 if (sizeof(long) == 4) {
61 rzm = min(ADDR2G, rzm);
62 memsize = memsize ? min(ADDR2G, memsize) : ADDR2G;
63 }
64 do {
65 size = 0;
66 type = tprot(addr);
67 do {
68 size += rzm;
69 if (memsize && addr + size >= memsize)
70 break;
71 } while (type == tprot(addr + size));
72 if (type == CHUNK_READ_WRITE || type == CHUNK_READ_ONLY) {
73 chunk[i].addr = addr;
74 chunk[i].size = size;
75 chunk[i].type = type;
76 i++;
77 }
78 addr += size;
79 } while (addr < memsize && i < MEMORY_CHUNKS);
80}
81
82void detect_memory_layout(struct mem_chunk chunk[])
83{
84 unsigned long flags, cr0;
85
86 memset(chunk, 0, MEMORY_CHUNKS * sizeof(struct mem_chunk));
87 if (memory_fast_detect(&chunk[0]) == 0)
88 return;
89 /* Disable IRQs, DAT and low address protection so tprot does the
90 * right thing and we don't get scheduled away with low address
91 * protection disabled.
92 */
93 flags = __raw_local_irq_stnsm(0xf8);
94 __ctl_store(cr0, 0, 0);
95 __ctl_clear_bit(0, 28);
96 find_memory_chunks(chunk);
97 __ctl_load(cr0, 0, 0);
98 __raw_local_irq_ssm(flags);
99}
100EXPORT_SYMBOL(detect_memory_layout);
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index e3b4cdbae34e..9c92407f625c 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -77,7 +77,7 @@ unsigned 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
80struct mem_chunk __meminitdata memory_chunk[MEMORY_CHUNKS]; 80struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
81volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */ 81volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
82static unsigned long __initdata memory_end; 82static unsigned long __initdata memory_end;
83 83
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-13 21:07:25 -0500