Revert "powerpc: Sync RPA note in zImage with kernel's RPA note"

This reverts commit 91a0030295, plus
commit 0dcd440120 ("powerpc: Revert CHRP
boot wrapper to real-base = 12MB on 32-bit") which depended on it.

Commit 91a00302 was causing NVRAM corruption on some pSeries machines,
for as-yet unknown reasons, so this reverts it until the cause is
identified.

Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/boot/addnote.c

@@ -11,12 +11,7 @@
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  *
- * Usage: addnote [-r realbase] zImage [note.elf]
- *
- * If note.elf is supplied, it is the name of an ELF file that contains
- * an RPA note to use instead of the built-in one.  Alternatively, the
- * note.elf file may be empty, in which case the built-in RPA note is
- * used (this is to simplify how this is invoked from the wrapper script).
+ * Usage: addnote zImage
  */
 #include <stdio.h>
 #include <stdlib.h>
@@ -48,29 +43,27 @@ char rpaname[] = "IBM,RPA-Client-Config";
  */
 #define N_RPA_DESCR	8
 unsigned int rpanote[N_RPA_DESCR] = {
-	1,			/* lparaffinity */
-	128,			/* min_rmo_size */
+	0,			/* lparaffinity */
+	64,			/* min_rmo_size */
 	0,			/* min_rmo_percent */
-	46,			/* max_pft_size */
+	40,			/* max_pft_size */
 	1,			/* splpar */
 	-1,			/* min_load */
-	1,			/* new_mem_def */
-	0,			/* ignore_my_client_config */
+	0,			/* new_mem_def */
+	1,			/* ignore_my_client_config */
 };
 
 #define ROUNDUP(len)	(((len) + 3) & ~3)
 
 unsigned char buf[512];
-unsigned char notebuf[512];
 
-#define GET_16BE(b, off)	(((b)[off] << 8) + ((b)[(off)+1]))
-#define GET_32BE(b, off)	((GET_16BE((b), (off)) << 16) + \
-				 GET_16BE((b), (off)+2))
+#define GET_16BE(off)	((buf[off] << 8) + (buf[(off)+1]))
+#define GET_32BE(off)	((GET_16BE(off) << 16) + GET_16BE((off)+2))
 
-#define PUT_16BE(b, off, v)	((b)[off] = ((v) >> 8) & 0xff, \
-				 (b)[(off) + 1] = (v) & 0xff)
-#define PUT_32BE(b, off, v)	(PUT_16BE((b), (off), (v) >> 16), \
-				 PUT_16BE((b), (off) + 2, (v)))
+#define PUT_16BE(off, v)	(buf[off] = ((v) >> 8) & 0xff, \
+				 buf[(off) + 1] = (v) & 0xff)
+#define PUT_32BE(off, v)	(PUT_16BE((off), (v) >> 16), \
+				 PUT_16BE((off) + 2, (v)))
 
 /* Structure of an ELF file */
 #define E_IDENT		0	/* ELF header */
@@ -95,95 +88,25 @@ unsigned char notebuf[512];
 
 unsigned char elf_magic[4] = { 0x7f, 'E', 'L', 'F' };
 
-unsigned char *read_rpanote(const char *fname, int *nnp)
-{
-	int notefd, nr, i;
-	int ph, ps, np;
-	int note, notesize;
-
-	notefd = open(fname, O_RDONLY);
-	if (notefd < 0) {
-		perror(fname);
-		exit(1);
-	}
-	nr = read(notefd, notebuf, sizeof(notebuf));
-	if (nr < 0) {
-		perror("read note");
-		exit(1);
-	}
-	if (nr == 0)		/* empty file */
-		return NULL;
-	if (nr < E_HSIZE ||
-	    memcmp(&notebuf[E_IDENT+EI_MAGIC], elf_magic, 4) != 0 ||
-	    notebuf[E_IDENT+EI_CLASS] != ELFCLASS32 ||
-	    notebuf[E_IDENT+EI_DATA] != ELFDATA2MSB)
-		goto notelf;
-	close(notefd);
-
-	/* now look for the RPA-note */
-	ph = GET_32BE(notebuf, E_PHOFF);
-	ps = GET_16BE(notebuf, E_PHENTSIZE);
-	np = GET_16BE(notebuf, E_PHNUM);
-	if (ph < E_HSIZE || ps < PH_HSIZE || np < 1)
-		goto notelf;
-
-	for (i = 0; i < np; ++i, ph += ps) {
-		if (GET_32BE(notebuf, ph + PH_TYPE) != PT_NOTE)
-			continue;
-		note = GET_32BE(notebuf, ph + PH_OFFSET);
-		notesize = GET_32BE(notebuf, ph + PH_FILESZ);
-		if (notesize < 34 || note + notesize > nr)
-			continue;
-		if (GET_32BE(notebuf, note) != strlen(rpaname) + 1 ||
-		    GET_32BE(notebuf, note + 8) != 0x12759999 ||
-		    strcmp((char *)&notebuf[note + 12], rpaname) != 0)
-			continue;
-		/* looks like an RPA note, return it */
-		*nnp = notesize;
-		return &notebuf[note];
-	}
-	/* no RPA note found */
-	return NULL;
-
- notelf:
-	fprintf(stderr, "%s is not a big-endian 32-bit ELF image\n", fname);
-	exit(1);
-}
-
 int
 main(int ac, char **av)
 {
-	int fd, n, i, ai;
+	int fd, n, i;
 	int ph, ps, np;
 	int nnote, nnote2, ns;
-	unsigned char *rpap;
-	char *p, *endp;
 
-	ai = 1;
-	if (ac >= ai + 2 && strcmp(av[ai], "-r") == 0) {
-		/* process -r realbase */
-		p = av[ai + 1];
-		descr[1] = strtol(p, &endp, 16);
-		if (endp == p || *endp != 0) {
-			fprintf(stderr, "Can't parse -r argument '%s' as hex\n",
-				p);
-			exit(1);
-		}
-		ai += 2;
-	}
-	if (ac != ai + 1 && ac != ai + 2) {
-		fprintf(stderr, "Usage: %s [-r realbase] elf-file [rpanote.elf]\n", av[0]);
+	if (ac != 2) {
+		fprintf(stderr, "Usage: %s elf-file\n", av[0]);
 		exit(1);
 	}
-	fd = open(av[ai], O_RDWR);
+	fd = open(av[1], O_RDWR);
 	if (fd < 0) {
-		perror(av[ai]);
+		perror(av[1]);
 		exit(1);
 	}
 
 	nnote = 12 + ROUNDUP(strlen(arch) + 1) + sizeof(descr);
 	nnote2 = 12 + ROUNDUP(strlen(rpaname) + 1) + sizeof(rpanote);
-	rpap = NULL;
 
 	n = read(fd, buf, sizeof(buf));
 	if (n < 0) {
@@ -197,25 +120,22 @@ main(int ac, char **av)
 	if (buf[E_IDENT+EI_CLASS] != ELFCLASS32
 	    || buf[E_IDENT+EI_DATA] != ELFDATA2MSB) {
 		fprintf(stderr, "%s is not a big-endian 32-bit ELF image\n",
-			av[ai]);
+			av[1]);
 		exit(1);
 	}
 
-	if (ac == ai + 2)
-		rpap = read_rpanote(av[ai + 1], &nnote2);
-
-	ph = GET_32BE(buf, E_PHOFF);
-	ps = GET_16BE(buf, E_PHENTSIZE);
-	np = GET_16BE(buf, E_PHNUM);
+	ph = GET_32BE(E_PHOFF);
+	ps = GET_16BE(E_PHENTSIZE);
+	np = GET_16BE(E_PHNUM);
 	if (ph < E_HSIZE || ps < PH_HSIZE || np < 1)
 		goto notelf;
 	if (ph + (np + 2) * ps + nnote + nnote2 > n)
 		goto nospace;
 
 	for (i = 0; i < np; ++i) {
-		if (GET_32BE(buf, ph + PH_TYPE) == PT_NOTE) {
+		if (GET_32BE(ph + PH_TYPE) == PT_NOTE) {
 			fprintf(stderr, "%s already has a note entry\n",
-				av[ai]);
+				av[1]);
 			exit(0);
 		}
 		ph += ps;
@@ -228,42 +148,37 @@ main(int ac, char **av)
 
 	/* fill in the program header entry */
 	ns = ph + 2 * ps;
-	PUT_32BE(buf, ph + PH_TYPE, PT_NOTE);
-	PUT_32BE(buf, ph + PH_OFFSET, ns);
-	PUT_32BE(buf, ph + PH_FILESZ, nnote);
+	PUT_32BE(ph + PH_TYPE, PT_NOTE);
+	PUT_32BE(ph + PH_OFFSET, ns);
+	PUT_32BE(ph + PH_FILESZ, nnote);
 
 	/* fill in the note area we point to */
 	/* XXX we should probably make this a proper section */
-	PUT_32BE(buf, ns, strlen(arch) + 1);
-	PUT_32BE(buf, ns + 4, N_DESCR * 4);
-	PUT_32BE(buf, ns + 8, 0x1275);
+	PUT_32BE(ns, strlen(arch) + 1);
+	PUT_32BE(ns + 4, N_DESCR * 4);
+	PUT_32BE(ns + 8, 0x1275);
 	strcpy((char *) &buf[ns + 12], arch);
 	ns += 12 + strlen(arch) + 1;
 	for (i = 0; i < N_DESCR; ++i, ns += 4)
-		PUT_32BE(buf, ns, descr[i]);
+		PUT_32BE(ns, descr[i]);
 
 	/* fill in the second program header entry and the RPA note area */
 	ph += ps;
-	PUT_32BE(buf, ph + PH_TYPE, PT_NOTE);
-	PUT_32BE(buf, ph + PH_OFFSET, ns);
-	PUT_32BE(buf, ph + PH_FILESZ, nnote2);
+	PUT_32BE(ph + PH_TYPE, PT_NOTE);
+	PUT_32BE(ph + PH_OFFSET, ns);
+	PUT_32BE(ph + PH_FILESZ, nnote2);
 
 	/* fill in the note area we point to */
-	if (rpap) {
-		/* RPA note supplied in file, just copy the whole thing over */
-		memcpy(buf + ns, rpap, nnote2);
-	} else {
-		PUT_32BE(buf, ns, strlen(rpaname) + 1);
-		PUT_32BE(buf, ns + 4, sizeof(rpanote));
-		PUT_32BE(buf, ns + 8, 0x12759999);
-		strcpy((char *) &buf[ns + 12], rpaname);
-		ns += 12 + ROUNDUP(strlen(rpaname) + 1);
-		for (i = 0; i < N_RPA_DESCR; ++i, ns += 4)
-			PUT_32BE(buf, ns, rpanote[i]);
-	}
+	PUT_32BE(ns, strlen(rpaname) + 1);
+	PUT_32BE(ns + 4, sizeof(rpanote));
+	PUT_32BE(ns + 8, 0x12759999);
+	strcpy((char *) &buf[ns + 12], rpaname);
+	ns += 12 + ROUNDUP(strlen(rpaname) + 1);
+	for (i = 0; i < N_RPA_DESCR; ++i, ns += 4)
+		PUT_32BE(ns, rpanote[i]);
 
 	/* Update the number of program headers */
-	PUT_16BE(buf, E_PHNUM, np + 2);
+	PUT_16BE(E_PHNUM, np + 2);
 
 	/* write back */
 	lseek(fd, (long) 0, SEEK_SET);
@@ -273,18 +188,18 @@ main(int ac, char **av)
 		exit(1);
 	}
 	if (i < n) {
-		fprintf(stderr, "%s: write truncated\n", av[ai]);
+		fprintf(stderr, "%s: write truncated\n", av[1]);
 		exit(1);
 	}
 
 	exit(0);
 
  notelf:
-	fprintf(stderr, "%s does not appear to be an ELF file\n", av[ai]);
+	fprintf(stderr, "%s does not appear to be an ELF file\n", av[1]);
 	exit(1);
 
  nospace:
 	fprintf(stderr, "sorry, I can't find space in %s to put the note\n",
-		av[ai]);
+		av[1]);
 	exit(1);
 }

arch/powerpc/boot/wrapper

@@ -306,13 +306,8 @@ fi
 
 # post-processing needed for some platforms
 case "$platform" in
-pseries)
-    ${CROSS}objcopy -O binary -j .fakeelf "$kernel" "$ofile".rpanote
-    $objbin/addnote "$ofile" "$ofile".rpanote
-    rm -r "$ofile".rpanote
-    ;;
-chrp)
-    $objbin/addnote -r c00000 "$ofile"
+pseries|chrp)
+    $objbin/addnote "$ofile"
     ;;
 coff)
     ${CROSS}objcopy -O aixcoff-rs6000 --set-start "$entry" "$ofile"

arch/powerpc/kernel/prom_init.c

@@ -671,7 +671,7 @@ static struct fake_elf {
 			u32	ignore_me;
 		} rpadesc;
 	} rpanote;
-} fake_elf __section(.fakeelf) = {
+} fake_elf = {
 	.elfhdr = {
 		.e_ident = { 0x7f, 'E', 'L', 'F',
 			     ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
@@ -713,13 +713,13 @@ static struct fake_elf {
 		.type = 0x12759999,
 		.name = "IBM,RPA-Client-Config",
 		.rpadesc = {
-			.lpar_affinity = 1,
-			.min_rmo_size = 128,	/* in megabytes */
+			.lpar_affinity = 0,
+			.min_rmo_size = 64,	/* in megabytes */
 			.min_rmo_percent = 0,
-			.max_pft_size = 46,	/* 2^46 bytes max PFT size */
+			.max_pft_size = 48,	/* 2^48 bytes max PFT size */
 			.splpar = 1,
 			.min_load = ~0U,
-			.new_mem_def = 1
+			.new_mem_def = 0
 		}
 	}
 };

arch/powerpc/kernel/vmlinux.lds.S

@@ -205,9 +205,6 @@ SECTIONS
 	}
 #endif
 
-	/* Fake ELF header containing RPA note; for addnote */
-	.fakeelf : AT(ADDR(.fakeelf) - LOAD_OFFSET) { *(.fakeelf) }
-
 	/* freed after init ends here */
 	. = ALIGN(PAGE_SIZE);
 	__init_end = .;