increase in the size of the state which needs to be saved when handling
signals.
-config MMAPPER
- tristate "iomem emulation driver"
- help
- This driver allows a host file to be used as emulated IO memory inside
- UML.
-
config PGTABLE_LEVELS
int
default 4 if 64BIT
obj-$(CONFIG_UML_NET_VECTOR) += vector.o
obj-$(CONFIG_MCONSOLE) += mconsole.o
-obj-$(CONFIG_MMAPPER) += mmapper_kern.o
obj-$(CONFIG_BLK_DEV_UBD) += ubd.o
obj-$(CONFIG_UML_SOUND) += hostaudio.o
obj-$(CONFIG_NULL_CHAN) += null.o
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * arch/um/drivers/mmapper_kern.c
- *
- * BRIEF MODULE DESCRIPTION
- *
- * Copyright (C) 2000 RidgeRun, Inc.
- * Author: RidgeRun, Inc.
- * Greg Lonnon glonnon@ridgerun.com or info@ridgerun.com
- *
- */
-
-#include <linux/stddef.h>
-#include <linux/types.h>
-#include <linux/fs.h>
-#include <linux/init.h>
-#include <linux/miscdevice.h>
-#include <linux/module.h>
-#include <linux/mm.h>
-
-#include <linux/uaccess.h>
-#include <mem_user.h>
-
-/* These are set in mmapper_init, which is called at boot time */
-static unsigned long mmapper_size;
-static unsigned long p_buf;
-static char *v_buf;
-
-static ssize_t mmapper_read(struct file *file, char __user *buf, size_t count,
- loff_t *ppos)
-{
- return simple_read_from_buffer(buf, count, ppos, v_buf, mmapper_size);
-}
-
-static ssize_t mmapper_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- if (*ppos > mmapper_size)
- return -EINVAL;
-
- return simple_write_to_buffer(v_buf, mmapper_size, ppos, buf, count);
-}
-
-static long mmapper_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
- return -ENOIOCTLCMD;
-}
-
-static int mmapper_mmap(struct file *file, struct vm_area_struct *vma)
-{
- int ret = -EINVAL;
- int size;
-
- if (vma->vm_pgoff != 0)
- goto out;
-
- size = vma->vm_end - vma->vm_start;
- if (size > mmapper_size)
- return -EFAULT;
-
- /*
- * XXX A comment above remap_pfn_range says it should only be
- * called when the mm semaphore is held
- */
- if (remap_pfn_range(vma, vma->vm_start, p_buf >> PAGE_SHIFT, size,
- vma->vm_page_prot))
- goto out;
- ret = 0;
-out:
- return ret;
-}
-
-static int mmapper_open(struct inode *inode, struct file *file)
-{
- return 0;
-}
-
-static int mmapper_release(struct inode *inode, struct file *file)
-{
- return 0;
-}
-
-static const struct file_operations mmapper_fops = {
- .owner = THIS_MODULE,
- .read = mmapper_read,
- .write = mmapper_write,
- .unlocked_ioctl = mmapper_ioctl,
- .mmap = mmapper_mmap,
- .open = mmapper_open,
- .release = mmapper_release,
- .llseek = default_llseek,
-};
-
-/*
- * No locking needed - only used (and modified) by below initcall and exitcall.
- */
-static struct miscdevice mmapper_dev = {
- .minor = MISC_DYNAMIC_MINOR,
- .name = "mmapper",
- .fops = &mmapper_fops
-};
-
-static int __init mmapper_init(void)
-{
- int err;
-
- printk(KERN_INFO "Mapper v0.1\n");
-
- v_buf = (char *) find_iomem("mmapper", &mmapper_size);
- if (mmapper_size == 0) {
- printk(KERN_ERR "mmapper_init - find_iomem failed\n");
- return -ENODEV;
- }
- p_buf = __pa(v_buf);
-
- err = misc_register(&mmapper_dev);
- if (err) {
- printk(KERN_ERR "mmapper - misc_register failed, err = %d\n",
- err);
- return err;
- }
- return 0;
-}
-
-static void __exit mmapper_exit(void)
-{
- misc_deregister(&mmapper_dev);
-}
-
-module_init(mmapper_init);
-module_exit(mmapper_exit);
-
-MODULE_AUTHOR("Greg Lonnon <glonnon@ridgerun.com>");
-MODULE_DESCRIPTION("DSPLinux simulator mmapper driver");
-MODULE_LICENSE("GPL");
* area for the same reason. ;)
*/
-extern unsigned long end_iomem;
+#include <as-layout.h> /* for high_physmem */
#define VMALLOC_OFFSET (__va_space)
-#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
+#define VMALLOC_START ((high_physmem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
#define VMALLOC_END (TASK_SIZE-2*PAGE_SIZE)
#define MODULES_VADDR VMALLOC_START
#define MODULES_END VMALLOC_END
extern int start_uml(void);
extern void paging_init(void);
-extern int parse_iomem(char *str, int *add);
extern void uml_cleanup(void);
extern void do_uml_exitcalls(void);
#ifndef _MEM_USER_H
#define _MEM_USER_H
-struct iomem_region {
- struct iomem_region *next;
- char *driver;
- int fd;
- int size;
- unsigned long phys;
- unsigned long virt;
-};
-
-extern struct iomem_region *iomem_regions;
-extern int iomem_size;
-
#define ROUND_4M(n) ((((unsigned long) (n)) + (1 << 22)) & ~((1 << 22) - 1))
-extern unsigned long find_iomem(char *driver, unsigned long *len_out);
extern void setup_physmem(unsigned long start, unsigned long usable,
unsigned long len);
extern void map_memory(unsigned long virt, unsigned long phys,
panic("%s: Failed to allocate %lu bytes align=%lx\n",
__func__, PAGE_SIZE, PAGE_SIZE);
- max_zone_pfn[ZONE_NORMAL] = end_iomem >> PAGE_SHIFT;
+ max_zone_pfn[ZONE_NORMAL] = high_physmem >> PAGE_SHIFT;
free_area_init(max_zone_pfn);
#if IS_ENABLED(CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA)
fd = physmem_fd;
*offset_out = phys;
}
- else if (phys < __pa(end_iomem)) {
- struct iomem_region *region = iomem_regions;
-
- while (region != NULL) {
- if ((phys >= region->phys) &&
- (phys < region->phys + region->size)) {
- fd = region->fd;
- *offset_out = phys - region->phys;
- break;
- }
- region = region->next;
- }
- }
return fd;
}
" be more, and the excess, if it's ever used, will just be swapped out.\n"
" Example: mem=64M\n\n"
);
-
-__uml_setup("iomem=", parse_iomem,
-"iomem=<name>,<file>\n"
-" Configure <file> as an IO memory region named <name>.\n\n"
-);
-
-/*
- * This list is constructed in parse_iomem and addresses filled in
- * setup_iomem, both of which run during early boot. Afterwards, it's
- * unchanged.
- */
-struct iomem_region *iomem_regions;
-
-/* Initialized in parse_iomem and unchanged thereafter */
-int iomem_size;
-
-unsigned long find_iomem(char *driver, unsigned long *len_out)
-{
- struct iomem_region *region = iomem_regions;
-
- while (region != NULL) {
- if (!strcmp(region->driver, driver)) {
- *len_out = region->size;
- return region->virt;
- }
-
- region = region->next;
- }
-
- return 0;
-}
-EXPORT_SYMBOL(find_iomem);
-
-static int setup_iomem(void)
-{
- struct iomem_region *region = iomem_regions;
- unsigned long iomem_start = high_physmem + PAGE_SIZE;
- int err;
-
- while (region != NULL) {
- err = os_map_memory((void *) iomem_start, region->fd, 0,
- region->size, 1, 1, 0);
- if (err)
- printk(KERN_ERR "Mapping iomem region for driver '%s' "
- "failed, errno = %d\n", region->driver, -err);
- else {
- region->virt = iomem_start;
- region->phys = __pa(region->virt);
- }
-
- iomem_start += region->size + PAGE_SIZE;
- region = region->next;
- }
-
- return 0;
-}
-
-__initcall(setup_iomem);
EXPORT_SYMBOL(task_size);
unsigned long brk_start;
-unsigned long end_iomem;
-EXPORT_SYMBOL(end_iomem);
#define MIN_VMALLOC (32 * 1024 * 1024)
setup_machinename(init_utsname()->machine);
physmem_size = PAGE_ALIGN(physmem_size);
- iomem_size = PAGE_ALIGN(iomem_size);
-
- max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
+ max_physmem = TASK_SIZE - uml_physmem - MIN_VMALLOC;
if (physmem_size > max_physmem) {
physmem_size = max_physmem;
os_info("Physical memory size shrunk to %llu bytes\n",
}
high_physmem = uml_physmem + physmem_size;
- end_iomem = high_physmem + iomem_size;
start_vm = VMALLOC_START;
.seccomp = using_seccomp,
.stub_start = STUB_START,
};
- struct iomem_region *iomem;
int ret;
if (using_seccomp) {
fcntl(init_data.stub_data_fd, F_SETFD, 0);
- /* In SECCOMP mode, these FDs are passed when needed */
- if (!using_seccomp) {
- for (iomem = iomem_regions; iomem; iomem = iomem->next)
- fcntl(iomem->fd, F_SETFD, 0);
- }
-
/* dup2 signaling FD/socket to STDIN */
if (dup2(tramp_data->sockpair[0], 0) < 0)
exit(3);
fatal("Failed to initialize default registers");
stop_ptraced_child(pid, 1);
}
-
-int __init parse_iomem(char *str, int *add)
-{
- struct iomem_region *new;
- struct stat64 buf;
- char *file, *driver;
- int fd, size;
-
- driver = str;
- file = strchr(str,',');
- if (file == NULL) {
- os_warn("parse_iomem : failed to parse iomem\n");
- goto out;
- }
- *file = '\0';
- file++;
- fd = open(file, O_RDWR, 0);
- if (fd < 0) {
- perror("parse_iomem - Couldn't open io file");
- goto out;
- }
-
- if (fstat64(fd, &buf) < 0) {
- perror("parse_iomem - cannot stat_fd file");
- goto out_close;
- }
-
- new = malloc(sizeof(*new));
- if (new == NULL) {
- perror("Couldn't allocate iomem_region struct");
- goto out_close;
- }
-
- size = (buf.st_size + UM_KERN_PAGE_SIZE) & ~(UM_KERN_PAGE_SIZE - 1);
-
- *new = ((struct iomem_region) { .next = iomem_regions,
- .driver = driver,
- .fd = fd,
- .size = size,
- .phys = 0,
- .virt = 0 });
- iomem_regions = new;
- iomem_size += new->size + UM_KERN_PAGE_SIZE;
-
- return 0;
- out_close:
- close(fd);
- out:
- return 1;
-}
projects / thirdparty / linux.git / commitdiff
