path: root/debian/patches/50_initrd.patch

Jérémie Koenig <jk@jk.fr.eu.org>
Add ramdisk support for d-i.

--- a/Makefrag.am
+++ b/Makefrag.am
@@ -306,6 +306,8 @@ libkernel_a_SOURCES += \
 	device/net_io.c \
 	device/net_io.h \
 	device/param.h \
+	device/ramdisk.c \
+	device/ramdisk.h \
 	device/subrs.c \
 	device/subrs.h \
 	device/tty.h
--- a/i386/i386at/conf.c
+++ b/i386/i386at/conf.c
@@ -31,6 +31,7 @@
 #include <device/conf.h>
 #include <kern/mach_clock.h>
 #include <i386at/model_dep.h>
+#include <device/ramdisk.h>
 
 #define	timename		"time"
 
@@ -129,6 +130,8 @@ struct dev_ops	dev_name_list[] =
 	  nodev },
 #endif	/* MACH_HYP */
 
+	RAMDISK_DEV_OPS,
+
 #ifdef	MACH_KMSG
         { kmsgname,     kmsgopen,       kmsgclose,       kmsgread,
           nodev,        kmsggetstat,    nodev,           nomap,
--- a/kern/boot_script.c
+++ b/kern/boot_script.c
@@ -88,12 +88,20 @@ prompt_resume_task (struct cmd *cmd, lon
   return boot_script_prompt_task_resume (cmd);
 }
 
+/* Create an initial ramdisk */
+static int
+ramdisk_create (struct cmd *cmd, long *val)
+{
+  return boot_script_ramdisk_create (cmd, (char **) val);
+}
+
 /* List of builtin symbols.  */
 static struct sym builtin_symbols[] =
 {
   { "task-create", VAL_FUNC, (long) create_task, VAL_TASK, 0 },
   { "task-resume", VAL_FUNC, (long) resume_task, VAL_NONE, 1 },
   { "prompt-task-resume", VAL_FUNC, (long) prompt_resume_task, VAL_NONE, 1 },
+  { "ramdisk-create", VAL_FUNC, (long) ramdisk_create, VAL_STR, 0 },
 };
 #define NUM_BUILTIN (sizeof (builtin_symbols) / sizeof (builtin_symbols[0]))
 
--- a/kern/bootstrap.c
+++ b/kern/bootstrap.c
@@ -51,6 +51,7 @@
 #include <vm/vm_user.h>
 #include <vm/pmap.h>
 #include <device/device_port.h>
+#include <device/ramdisk.h>
 
 #if	MACH_KDB
 #include <machine/db_machdep.h>
@@ -796,6 +797,23 @@ boot_script_free (void *ptr, unsigned in
 }
 
 int
+boot_script_ramdisk_create (struct cmd *cmd, char **name)
+{
+  struct multiboot_module *mod = cmd->hook;
+  vm_size_t size = mod->mod_end - mod->mod_start;
+  kern_return_t rc;
+  int no;
+
+  rc = ramdisk_create (size, (void *) phystokv (mod->mod_start), &no);
+  if (rc != KERN_SUCCESS)
+    return BOOT_SCRIPT_MACH_ERROR;
+
+  *name = boot_script_malloc (RAMDISK_NAMESZ);
+  sprintf(*name, RAMDISK_NAME "%d", no);
+  return 0;
+}
+
+int
 boot_script_task_create (struct cmd *cmd)
 {
   kern_return_t rc = task_create(TASK_NULL, FALSE, &cmd->task);
--- /dev/null
+++ b/device/ramdisk.c
@@ -0,0 +1,160 @@
+#include <mach/vm_param.h>
+#include <machine/vm_param.h>
+#include <vm/vm_kern.h>
+#include <vm/vm_user.h>
+#include <device/device_types.h>
+#include <device/ds_routines.h>
+#include <device/conf.h>
+#include <device/ramdisk.h>
+#include <kern/printf.h>
+#include <string.h>
+
+static struct ramdisk {
+	void *data;
+	vm_size_t size;
+} ramdisk[RAMDISK_MAX];
+
+static int ramdisk_num = 0;
+
+/* Initial ramdisks are created from the boot scripts */
+int ramdisk_create(vm_size_t size, const void *initdata, int *out_no)
+{
+	struct ramdisk *rd = &ramdisk[ramdisk_num];
+	int err;
+
+	if(ramdisk_num >= RAMDISK_MAX)
+		return -1;
+
+	/* allocate the memory */
+	rd->size = round_page(size);
+	err = kmem_alloc(kernel_map, (vm_offset_t *) &rd->data, rd->size);
+	if(err != KERN_SUCCESS)
+		return err;
+
+	/* initialize */
+	if(initdata)
+		memcpy(rd->data, initdata, rd->size);
+	else
+		memset(rd->data, 0, rd->size);
+
+	/* report */
+	if(out_no) *out_no = ramdisk_num;
+	printf("%s%d: %lu bytes @%p\n", RAMDISK_NAME, ramdisk_num,
+			(unsigned long) rd->size, rd->data);
+
+	ramdisk_num++;
+	return KERN_SUCCESS;
+}
+
+/* On d_open() we just check whether the ramdisk exists */
+int ramdisk_open(int dev, int mode, io_req_t ior)
+{
+	return (dev < ramdisk_num) ? D_SUCCESS : D_NO_SUCH_DEVICE;
+}
+
+/* d_getstat() is used to query the device characteristics */
+int ramdisk_getstat(int dev, dev_flavor_t flavor, dev_status_t status,
+		mach_msg_type_number_t *status_count)
+{
+	switch(flavor) {
+		case DEV_GET_SIZE:
+			status[DEV_GET_SIZE_DEVICE_SIZE] = ramdisk[dev].size;
+			status[DEV_GET_SIZE_RECORD_SIZE] = RAMDISK_BLOCKSZ;
+			*status_count = DEV_GET_SIZE_COUNT;
+			return D_SUCCESS;
+
+		case DEV_GET_RECORDS:
+			status[DEV_GET_RECORDS_DEVICE_RECORDS]
+					= ramdisk[dev].size / RAMDISK_BLOCKSZ;
+			status[DEV_GET_RECORDS_RECORD_SIZE] = RAMDISK_BLOCKSZ;
+			*status_count = DEV_GET_RECORDS_COUNT;
+			return D_SUCCESS;
+	}
+	return D_INVALID_OPERATION;
+}
+
+/* TODO: implement freeramdisk with setstat() ? */
+
+/* Check the given io request and compute a pointer to the ramdisk data and the
+ * amount to be handled. */
+static int ramdisk_ioreq(int dev, io_req_t ior, void **data, int *amt)
+{
+	vm_offset_t ofs = ior->io_recnum * RAMDISK_BLOCKSZ;
+	if(ofs >= ramdisk[dev].size)
+		return D_INVALID_RECNUM;
+
+	*data = (char*) ramdisk[dev].data + ofs;
+	*amt = ior->io_count;
+	if(ofs + *amt > ramdisk[dev].size)
+		*amt = ramdisk[dev].size - ofs;
+
+	return KERN_SUCCESS;
+}
+
+/* Copy data from a vm_map_copy by mapping it temporarily. */
+static int mem_map_cpy(void *dst, vm_map_copy_t src, int amt)
+{
+	vm_offset_t srcaddr;
+	int err;
+
+	err = vm_map_copyout(device_io_map, &srcaddr, src);
+	if (err != KERN_SUCCESS)
+		return err;
+
+	memcpy(dst, (void *) srcaddr, amt);
+	vm_deallocate(device_io_map, srcaddr, amt);
+	return KERN_SUCCESS;
+}
+
+int ramdisk_read(int dev, io_req_t ior)
+{
+	void *data;
+	int amt, err;
+
+	err = ramdisk_ioreq(dev, ior, &data, &amt);
+	if(err != KERN_SUCCESS)
+		return err;
+
+	err = device_read_alloc (ior, ior->io_count);
+	if (err != KERN_SUCCESS)
+		return err;
+
+	memcpy(ior->io_data, data, amt);
+	ior->io_residual = ior->io_count - amt;
+
+	return D_SUCCESS;
+}
+
+int ramdisk_write(int dev, io_req_t ior)
+{
+	void *data;
+	int amt, err;
+
+	err = ramdisk_ioreq(dev, ior, &data, &amt);
+	if(err != KERN_SUCCESS)
+		return err;
+
+	if (!(ior->io_op & IO_INBAND)) {
+		/* Out-of-band data is transmitted as a vm_map_copy */
+		err = mem_map_cpy(data, (vm_map_copy_t) ior->io_data, amt);
+		if(err != KERN_SUCCESS)
+			return err;
+	} else {
+		/* In-band data can be accessed directly */
+		memcpy(data, ior->io_data, amt);
+	}
+
+	ior->io_residual = ior->io_count - amt;
+	return D_SUCCESS;
+}
+
+vm_offset_t ramdisk_mmap(int dev, vm_offset_t off, vm_prot_t prot)
+{
+	if(dev >= ramdisk_num)
+		return -1;
+	if(off >= ramdisk[dev].size)
+		return -1;
+
+	return pmap_phys_to_frame(kvtophys((vm_offset_t) ramdisk[dev].data + off));
+}
+
--- /dev/null
+++ b/device/ramdisk.h
@@ -0,0 +1,47 @@
+#ifndef _KERN_RAMDISK_H_
+#define _KERN_RAMDISK_H_
+
+#include <vm/pmap.h>
+#include <device/io_req.h>
+#include <device/conf.h>
+
+/* Maximum number of ramdisk devices */
+#define RAMDISK_MAX 4
+
+/* The block size used (userspace requires 512) */
+#define RAMDISK_BLOCKSZ 512
+
+/* Name associated to the ramdisk major */
+#define RAMDISK_NAME "rd"
+#define RAMDISK_NAMESZ (sizeof RAMDISK_NAME + sizeof (int) * 3 + 1)
+
+/* Create a new ramdisk of the given size. On success, if out_no and/or out_ptr
+ * are not NULL, the device number and pointer to the ramdisk's data are stored
+ * there. Returns D_SUCCESS or D_NO_MEMORY.  */
+int ramdisk_create(vm_size_t size, const void *initdata, int *out_no);
+
+/* Device operations */
+int ramdisk_open(int, int, io_req_t);
+int ramdisk_getstat(int, dev_flavor_t, dev_status_t, mach_msg_type_number_t *);
+int ramdisk_read(int, io_req_t);
+int ramdisk_write(int, io_req_t);
+vm_offset_t ramdisk_mmap(int, vm_offset_t, vm_prot_t);
+
+/* dev_ops initializer to be used from <machine>/conf.c */
+#define RAMDISK_DEV_OPS { \
+		.d_name = RAMDISK_NAME, \
+		.d_open = ramdisk_open, \
+		.d_close = nulldev, \
+		.d_read = ramdisk_read, \
+		.d_write = ramdisk_write, \
+		.d_getstat = ramdisk_getstat, \
+		.d_setstat = nodev, \
+		.d_mmap = ramdisk_mmap, \
+		.d_async_in = nodev, \
+		.d_reset = nulldev, \
+		.d_port_death = nulldev, \
+		.d_subdev = 0, \
+		.d_dev_info = nodev, \
+	}
+
+#endif