[boot] Expand /bootopts to 1023 bytes

bootblocks/boot_minix.c

@@ -22,6 +22,7 @@
 static byte_t sb_block [BLOCK_SIZE];  // super block block buffer
 #define sb_data	((struct super_block *)sb_block)
 
+static char linux[] = "/linux";
 static int i_now;
 static int i_boot;
 static int loadaddr;
@@ -82,10 +83,10 @@ void load_prog ()
 	load_file ();
 
 	for (int d = 0; d < BLOCK_SIZE /*(int)i_data->i_size*/; d += DIRENT_SIZE) {
-		if (!strcmp ((char *)(d_dir + 2 + d), "linux")) {
+		if (!strcmp ((char *)(d_dir + 2 + d), linux+1)) {
 			i_boot = i_now = (*(int *)(d_dir + d)) - 1;
 			if (i_boot == -1) continue;
-			puts ("/linux");
+			puts (linux);
 			loadaddr = LOADSEG << 4;
 			load_file();
 			continue;
@@ -121,7 +122,7 @@ static int strcmp (const char * s, const char * d)
 
 static void load_super ()
 {
-	disk_read (2, 2, sb_block, seg_data ());
+	disk_read (2, 1, sb_block, seg_data ());
 
 	/*
 	if (sb_data->s_log_zone_size) {

elks/arch/i86/boot/setup.S

@@ -7,10 +7,9 @@
 ! both setup.s and system has been loaded by the bootblock.
 !
 ! This code asks the bios for memory/disk/other parameters, and
-! puts them in a "safe" place: INITSEG:0-INITSEG:01FF, ie where the
-! boot-block used to be. It is then up to the protected mode
-! system to read them from there before the area is overwritten
-! for buffer-blocks.
+! puts them in a "safe" place: REL_INITSEG:0-REL_INITSEG:01FF, ie where
+! the boot-block used to be. It is then up to the kernel to read them
+! from there before the area is released to the main memory allocator.
 !
 ! Move PS/2 aux init code to psaux.c
 ! ([email protected]) 03Oct92
@@ -36,7 +35,7 @@
 !
 ! index
 !	...
-!	4:	display page
+!	4:	display page, 1 byte UNUSED
 !	6:	video mode, 1 byte
 !	7:	screen_cols, 1 byte
 !	8:	video data, 2 bytes
@@ -899,7 +898,6 @@ novga:	mov	%al,14		// CGA 25 rows
 
 	mov	$0x0f,%ah
 	int	$0x10
-	mov	%bx,4		// bh = display page
 	mov	%ax,6		// al = video mode, ah = window width
 
 	call	getcpu		// implemented in cputype.S
@@ -946,7 +944,10 @@ putc:	push %ax
 
 #ifdef CONFIG_BOOTOPTS
 //
-// load /bootopts for FAT filesystem boot
+// load /bootopts file for FAT filesystem boot
+//      If size > 512 bytes, both sectors must be contiguous.
+//      This is currently guaranteed by providing a 1K /bootopts in
+//      distribution images, so later edits will remain contiguous.
 //
 // Uses previous boot sector's BPB contents for disk geometry
 // and previous boot sector's buffer which still holds root directory sector.
@@ -990,20 +991,19 @@ bootopts:
 	xor	%bp,%bp
 
 	mov	root_dev,%al	// Physical Device Address
-	mov	$0xD6,%ah		// Read Data
-	mov	$512,%bx
-	test	$0x10,%al		// Check Floppy Disk or Hard Disk
+	mov	$0xD6,%ah	// Read Data
+	mov	$1024,%bx	// 1K bytes
+	test	$0x10,%al	// Check Floppy Disk or Hard Disk
 	jz	pc98_int1b
 #ifdef CONFIG_IMG_FD1232
-	mov	$1024,%bx
-	mov	$0x03,%ch		// 1024 Bytes per sector
-	inc	%dl				// sector number for PC_98 Floppy Disk
+	mov	$0x03,%ch	// 1024 Bytes per sector
+	inc	%dl		// sector number for PC_98 Floppy Disk
 #else
-	mov	$0x02,%ch		// 512 Bytes per sector
-	inc	%dl				// sector number for PC_98 Floppy Disk
+	mov	$0x02,%ch	// 512 Bytes per sector
+	inc	%dl		// sector number for PC_98 Floppy Disk
 #endif
 pc98_int1b:
-	int	$0x1B			// BIOS disk interrupt
+	int	$0x1B		// BIOS disk interrupt
 	pop	%bp
 #else
 	mov	$INITSEG,%ax
@@ -1013,7 +1013,7 @@ pc98_int1b:
 	mov	$DEF_OPTSEG,%ax	// ES:BX = DEF_OPTSEG:0
 	mov	%ax,%es
 	xor	%bx,%bx
-	mov	$0x0201,%ax	// BIOS read disk, 1 sector
+	mov	$0x0202,%ax	// BIOS read disk, 2 sectors
 	int	$0x13		// BIOS disk interrupt
 #endif
 

elks/arch/i86/drivers/block/directfd.c

@@ -1204,7 +1204,7 @@ static void DFPROC redo_fd_request(void)
     numsectors = req->rq_nr_sectors;
 #ifdef CONFIG_TRACK_CACHE
     use_cache = (command == FD_READ) && (req->rq_errors < 4)
-        && (SETUP_CPU_TYPE != 7 || running_qemu);    /* disable cache on 32-bit systems */
+        && (arch_cpu != 7 || running_qemu);     /* disable cache on 32-bit systems */
     if (use_cache) {
         /* full track caching only if cache large enough */
         if (CACHE_FULL_TRACK && floppy->sect < CACHE_SIZE)
@@ -1453,7 +1453,7 @@ static int DFPROC get_fdc_version(void)
     }
     switch (reply_buffer[0]) {
     case 0x80:
-        if (SETUP_CPU_TYPE > 5) {       /* 80286 CPU PC/AT or better */
+        if (arch_cpu > 5) {     /* 80286 CPU PC/AT or better */
             type = FDC_TYPE_8272PC_AT;
             name = "8272A (PC/AT)";
         } else {

elks/arch/i86/kernel/system.c

@@ -15,6 +15,7 @@
 seg_t membase, memend;  /* start and end segment of available main memory */
 unsigned int heapsize;  /* max size of kernel near heap */
 byte_t sys_caps;        /* system capabilities bits */
+unsigned char arch_cpu; /* CPU type from cputype.S */
 
 unsigned int INITPROC setup_arch(void)
 {
@@ -65,10 +66,10 @@ unsigned int INITPROC setup_arch(void)
     }
 #endif
 
+    arch_cpu = SETUP_CPU_TYPE;
 #ifdef SYS_CAPS
     sys_caps = SYS_CAPS;    /* custom system capabilities */
 #else
-    byte_t arch_cpu = SETUP_CPU_TYPE;
     if (arch_cpu > 5)       /* 80286+ IBM PC/AT capabilities or Unknown CPU */
         sys_caps = CAP_ALL;
     debug("arch %d sys_caps %02x\n", arch_cpu, sys_caps);

elks/include/linuxmt/config.h

@@ -13,14 +13,16 @@
 #define CONFIG_MSDOS_PARTITION  1               /* support DOS HD partitions */
 #define CONFIG_FS_DEV           1               /* support FAT /dev folder */
 
-#ifdef CONFIG_ARCH_IBMPC
-#define MAX_SERIAL              4               /* max number of serial tty devices*/
-
 /*
- * Setup data - normally queried by startup setup.S code, but can
- * be overridden for embedded systems with less overhead.
- * See setup.S for more details.
+ * SETUP_ defines are initialzied by setup.S and queried only during kernel init.
+ * The REL_INITSEG segment is released at end of kernel init. If used later any
+ * values must be copied, as afterwards setupb/setupw will return incorrect data.
+ * These defines are overridden for ROM based systems w/o setup code.
+ * See setup.S for setupb/setupw offsets.
  */
+
+#ifdef CONFIG_ARCH_IBMPC
+#define MAX_SERIAL              4               /* max number of serial tty devices*/
 #define SETUP_VID_COLS          setupb(7)       /* BIOS video # columns */
 #define SETUP_VID_LINES         setupb(14)      /* BIOS video # lines */
 #define SETUP_CPU_TYPE          setupb(0x20)    /* processor type */
@@ -137,30 +139,33 @@
 #define DMASEGEND       DMASEG      /* no DMASEG buffer */
 #endif
 
+/* Define segment locations of low memory, must not overlap */
+
 #ifdef CONFIG_ROMCODE
 #define DMASEG          0x80        /* start of floppy sector buffer */
 #define KERNEL_DATA     DMASEGEND   /* kernel data segment */
 #define SETUP_DATA      CONFIG_ROM_SETUP_DATA
-#endif
 
-#if (defined(CONFIG_ARCH_IBMPC) || defined(CONFIG_ARCH_8018X)) && !defined(CONFIG_ROMCODE)
-/* Define segment locations of low memory, must not overlap */
-#define OPTSEGSZ        0x200       /* max size of /bootopts file (512 bytes max) */
-#define DEF_OPTSEG      0x50        /* 0x200 bytes boot options at lowest usable ram */
-#define REL_INITSEG     0x70        /* 0x200 bytes setup data */
-#define DMASEG          0x90        /* start of floppy sector buffer */
+#else /* !CONFIG_ROMCODE */
+
+#ifdef CONFIG_ARCH_IBMPC
+#define OPTSEGSZ        0x400       /* max size of /bootopts file (1024 bytes max) */
+#define DEF_OPTSEG      0x50        /* 0x400 bytes boot options at lowest usable ram */
+#define REL_INITSEG     0x90        /* 0x200 bytes setup data */
+#define DMASEG          0xB0        /* start of floppy sector buffer */
 #define REL_SYSSEG      DMASEGEND   /* kernel code segment */
 #define SETUP_DATA      REL_INITSEG
 #endif
 
-#if defined(CONFIG_ARCH_PC98) && !defined(CONFIG_ROMCODE)
-/* Define segment locations of low memory, must not overlap */
-#define OPTSEGSZ        0x200       /* max size of /bootopts file (512 bytes max) */
-#define DEF_OPTSEG      0x60        /* 0x200 bytes boot options at lowest usable ram */
-#define REL_INITSEG     0x80        /* 0x200 bytes setup data */
-#define DMASEG          0xA0        /* start of floppy sector buffer */
+#ifdef CONFIG_ARCH_PC98
+#define OPTSEGSZ        0x400       /* max size of /bootopts file (1024 bytes max) */
+#define DEF_OPTSEG      0x60        /* 0x400 bytes boot options at lowest usable ram */
+#define REL_INITSEG     0xA0        /* 0x200 bytes setup data */
+#define DMASEG          0xC0        /* start of floppy sector buffer */
 #define REL_SYSSEG      DMASEGEND   /* kernel code segment */
 #define SETUP_DATA      REL_INITSEG
 #endif
 
+#endif /* !CONFIG_ROMCODE */
+
 #endif

elks/include/linuxmt/kernel.h

@@ -18,6 +18,7 @@
 #define structof(p,t,m) ((t *) ((char *) (p) - offsetof (t,m)))
 
 extern char running_qemu;
+extern unsigned char arch_cpu;
 extern dev_t dev_console;
 extern int debug_level;