--- /dev/null
- }
+/******************************************************************************
+ * core.c
+ *
+ * Interface to privileged domain-0 commands.
+ *
+ * Copyright (c) 2002-2004, K A Fraser, B Dragovic
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/swap.h>
+#include <linux/smp_lock.h>
+#include <linux/swapctl.h>
+#include <linux/iobuf.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/seq_file.h>
+
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/uaccess.h>
+#include <asm/tlb.h>
+#include <asm/proc_cmd.h>
+#include <asm/hypervisor-ifs/dom0_ops.h>
+#include <asm/xen_proc.h>
+
+static struct proc_dir_entry *privcmd_intf;
+
+static int privcmd_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long data)
+{
+ int ret = 0;
+
+ switch ( cmd )
+ {
+ case IOCTL_PRIVCMD_HYPERCALL:
+ {
+ privcmd_hypercall_t hypercall;
+
+ if ( copy_from_user(&hypercall, (void *)data, sizeof(hypercall)) )
+ return -EFAULT;
+
+ __asm__ __volatile__ (
+ "pushl %%ebx; pushl %%ecx; pushl %%edx; pushl %%esi; pushl %%edi; "
+ "movl 4(%%eax),%%ebx ;"
+ "movl 8(%%eax),%%ecx ;"
+ "movl 12(%%eax),%%edx ;"
+ "movl 16(%%eax),%%esi ;"
+ "movl 20(%%eax),%%edi ;"
+ "movl (%%eax),%%eax ;"
+ TRAP_INSTR "; "
+ "popl %%edi; popl %%esi; popl %%edx; popl %%ecx; popl %%ebx"
+ : "=a" (ret) : "0" (&hypercall) : "memory" );
+
+ }
+ break;
+
++ case IOCTL_PRIVCMD_MMAP:
++ {
++#define PRIVCMD_MMAP_SZ 32
++ privcmd_mmap_t mmapcmd;
++ privcmd_mmap_entry_t msg[PRIVCMD_MMAP_SZ], *p;
++ int i;
++
++ if ( copy_from_user(&mmapcmd, (void *)data, sizeof(mmapcmd)) )
++ return -EFAULT;
++
++ p = mmapcmd.entry;
++
++ for (i=0; i<mmapcmd.num; i+=PRIVCMD_MMAP_SZ, p+=PRIVCMD_MMAP_SZ)
++ {
++ int j, n = ((mmapcmd.num-i)>PRIVCMD_MMAP_SZ)?
++ PRIVCMD_MMAP_SZ:(mmapcmd.num-i);
++ if ( copy_from_user(&msg, p, n*sizeof(privcmd_mmap_entry_t)) )
++ return -EFAULT;
++
++ for (j=0;j<n;j++)
++ {
++ struct vm_area_struct *vma =
++ find_vma( current->mm, msg[j].va );
++
++ if (!vma)
++ return -EINVAL;
++
++ if (msg[j].va > PAGE_OFFSET)
++ return -EINVAL;
++
++ if (msg[j].va + (msg[j].npages<<PAGE_SHIFT) > vma->vm_end)
++ return -EINVAL;
++
++ if (direct_remap_area_pages(vma->vm_mm,
++ msg[j].va&PAGE_MASK,
++ msg[j].mfn<<PAGE_SHIFT,
++ msg[j].npages<<PAGE_SHIFT,
++ vma->vm_page_prot))
++ return -EINVAL;
++ }
++ }
++ ret = 0;
++ }
++ break;
++
+ default:
+ ret = -EINVAL;
+ break;
- ioctl : privcmd_ioctl
++ }
+ return ret;
+}
+
++static int privcmd_mmap(struct file * file, struct vm_area_struct * vma)
++{
++printk(KERN_ALERT"privcmd_mmap\n");
++ /* DONTCOPY is essential for Xen as copy_page_range is broken. */
++ vma->vm_flags |= VM_RESERVED | VM_IO | VM_DONTCOPY;
++
++ return 0;
++}
+
+static struct file_operations privcmd_file_ops = {
++ ioctl : privcmd_ioctl,
++ mmap: privcmd_mmap
+};
+
+
+static int __init init_module(void)
+{
+ if ( !(start_info.flags & SIF_PRIVILEGED) )
+ return 0;
+
+ privcmd_intf = create_xen_proc_entry("privcmd", 0400);
+ if ( privcmd_intf != NULL )
+ {
+ privcmd_intf->owner = THIS_MODULE;
+ privcmd_intf->nlink = 1;
+ privcmd_intf->proc_fops = &privcmd_file_ops;
+ }
+
+ return 0;
+}
+
+
+static void __exit cleanup_module(void)
+{
+ if ( privcmd_intf == NULL ) return;
+ remove_xen_proc_entry("privcmd");
+ privcmd_intf = NULL;
+}
+
+
+module_init(init_module);
+module_exit(cleanup_module);
--- /dev/null
+/*
+ * arch/xen/mm/ioremap.c
+ *
+ * Re-map IO memory to kernel address space so that we can access it.
+ *
+ * (C) Copyright 1995 1996 Linus Torvalds
+ *
+ * Modifications for Xenolinux (c) 2003 Keir Fraser
+ */
+
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/vmalloc.h>
+#include <asm/io.h>
+#include <asm/pgalloc.h>
+#include <asm/uaccess.h>
+#include <asm/tlb.h>
+#include <asm/mmu.h>
+
+#if defined(CONFIG_XEN_PRIVILEGED_GUEST)
+
+/* These hacky macros avoid phys->machine translations. */
+#define __direct_pte(x) ((pte_t) { (x) } )
+#define __direct_mk_pte(page_nr,pgprot) \
+ __direct_pte(((page_nr) << PAGE_SHIFT) | pgprot_val(pgprot))
+#define direct_mk_pte_phys(physpage, pgprot) \
+ __direct_mk_pte((physpage) >> PAGE_SHIFT, pgprot)
+
+static inline void direct_remap_area_pte(pte_t *pte,
+ unsigned long address,
+ unsigned long size,
+ unsigned long machine_addr,
+ pgprot_t prot,
+ domid_t domid)
+{
+ unsigned long end;
+
+ mmu_update_t *u, *v;
+ u = v = vmalloc(3*PAGE_SIZE); /* plenty */
+
+ /* If not I/O mapping then specify General-Purpose Subject Domain (GPS). */
+ if ( domid != 0 )
+ {
+ v[0].val = (unsigned long)(domid<<16) & ~0xFFFFUL;
+ v[0].ptr = (unsigned long)(domid<< 0) & ~0xFFFFUL;
+ v[1].val = (unsigned long)(domid>>16) & ~0xFFFFUL;
+ v[1].ptr = (unsigned long)(domid>>32) & ~0xFFFFUL;
+ v[0].ptr |= MMU_EXTENDED_COMMAND;
+ v[0].val |= MMUEXT_SET_SUBJECTDOM_L;
+ v[1].ptr |= MMU_EXTENDED_COMMAND;
+ v[1].val |= MMUEXT_SET_SUBJECTDOM_H;
+ v += 2;
+ }
+
+ address &= ~PMD_MASK;
+ end = address + size;
+ if (end > PMD_SIZE)
+ end = PMD_SIZE;
+ if (address >= end)
+ BUG();
+ do {
++#if 0 /* thanks to new ioctl mmaping interface this is no longer a bug */
+ if (!pte_none(*pte)) {
+ printk("direct_remap_area_pte: page already exists\n");
+ BUG();
+ }
++#endif
+ v->ptr = virt_to_machine(pte);
+ v->val = (machine_addr & PAGE_MASK) | pgprot_val(prot) | _PAGE_IO;
+ v++;
+ address += PAGE_SIZE;
+ machine_addr += PAGE_SIZE;
+ pte++;
+ } while (address && (address < end));
+
+ if ( ((v-u) != 0) && (HYPERVISOR_mmu_update(u, v-u) < 0) )
+ printk(KERN_WARNING "Failed to ioremap %08lx->%08lx (%08lx)\n",
+ end-size, end, machine_addr-size);
+ vfree(u);
+}
+
+static inline int direct_remap_area_pmd(struct mm_struct *mm,
+ pmd_t *pmd,
+ unsigned long address,
+ unsigned long size,
+ unsigned long machine_addr,
+ pgprot_t prot,
+ domid_t domid)
+{
+ unsigned long end;
+
+ address &= ~PGDIR_MASK;
+ end = address + size;
+ if (end > PGDIR_SIZE)
+ end = PGDIR_SIZE;
+ machine_addr -= address;
+ if (address >= end)
+ BUG();
+ do {
+ pte_t * pte = pte_alloc(mm, pmd, address);
+ if (!pte)
+ return -ENOMEM;
+ direct_remap_area_pte(pte, address, end - address,
+ address + machine_addr, prot, domid);
+ address = (address + PMD_SIZE) & PMD_MASK;
+ pmd++;
+ } while (address && (address < end));
+ return 0;
+}
+
+int direct_remap_area_pages(struct mm_struct *mm,
+ unsigned long address,
+ unsigned long machine_addr,
+ unsigned long size,
+ pgprot_t prot,
+ domid_t domid)
+{
+ int error = 0;
+ pgd_t * dir;
+ unsigned long end = address + size;
+
++printk("direct_remap_area_pages va=%08lx ma=%08lx size=%d\n",
++ address, machine_addr, size);
++
+ machine_addr -= address;
+ dir = pgd_offset(mm, address);
+ flush_cache_all();
+ if (address >= end)
+ BUG();
+ spin_lock(&mm->page_table_lock);
+ do {
+ pmd_t *pmd = pmd_alloc(mm, dir, address);
+ error = -ENOMEM;
+ if (!pmd)
+ break;
+ error = direct_remap_area_pmd(mm, pmd, address, end - address,
+ machine_addr + address, prot, domid);
+ if (error)
+ break;
+ address = (address + PGDIR_SIZE) & PGDIR_MASK;
+ dir++;
+ } while (address && (address < end));
+ spin_unlock(&mm->page_table_lock);
+ flush_tlb_all();
+ return error;
+}
+
+#endif /* CONFIG_XEN_PRIVILEGED_GUEST */
+
+
+/*
+ * Remap an arbitrary machine address space into the kernel virtual
+ * address space. Needed when a privileged instance of Xenolinux wants
+ * to access space outside its world directly.
+ *
+ * NOTE! We need to allow non-page-aligned mappings too: we will obviously
+ * have to convert them into an offset in a page-aligned mapping, but the
+ * caller shouldn't need to know that small detail.
+ */
+void * __ioremap(unsigned long machine_addr,
+ unsigned long size,
+ unsigned long flags)
+{
+#if defined(CONFIG_XEN_PRIVILEGED_GUEST)
+ void * addr;
+ struct vm_struct * area;
+ unsigned long offset, last_addr;
+ pgprot_t prot;
+
+ /* Only privileged Xenolinux can make unchecked pagetable updates. */
+ if ( !(start_info.flags & SIF_PRIVILEGED) )
+ return NULL;
+
+ /* Don't allow wraparound or zero size */
+ last_addr = machine_addr + size - 1;
+ if (!size || last_addr < machine_addr)
+ return NULL;
+
+ /* Mappings have to be page-aligned */
+ offset = machine_addr & ~PAGE_MASK;
+ machine_addr &= PAGE_MASK;
+ size = PAGE_ALIGN(last_addr+1) - machine_addr;
+
+ /* Ok, go for it */
+ area = get_vm_area(size, VM_IOREMAP);
+ if (!area)
+ return NULL;
+ addr = area->addr;
+ prot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY |
+ _PAGE_ACCESSED | flags);
+ if (direct_remap_area_pages(&init_mm, VMALLOC_VMADDR(addr),
+ machine_addr, size, prot, 0)) {
+ vfree(addr);
+ return NULL;
+ }
+ return (void *) (offset + (char *)addr);
+#else
+ return NULL;
+#endif
+}
+
+void iounmap(void *addr)
+{
+ vfree((void *)((unsigned long)addr & PAGE_MASK));
+}
+
+/* implementation of boot time ioremap for purpose of provising access
+to the vga console for privileged domains. Unlike boot time ioremap on
+other architectures, ours is permanent and not reclaimed when then vmalloc
+infrastructure is started */
+
+void __init *bt_ioremap(unsigned long machine_addr, unsigned long size)
+{
+ unsigned long offset, last_addr;
+ unsigned int nrpages;
+ enum fixed_addresses idx;
+
+ /* Don't allow wraparound or zero size */
+ last_addr = machine_addr + size - 1;
+ if (!size || last_addr < machine_addr)
+ return NULL;
+
+ /*
+ * Mappings have to be page-aligned
+ */
+ offset = machine_addr & ~PAGE_MASK;
+ machine_addr &= PAGE_MASK;
+ size = PAGE_ALIGN(last_addr) - machine_addr;
+
+ /*
+ * Mappings have to fit in the FIX_BTMAP area.
+ */
+ nrpages = size >> PAGE_SHIFT;
+ if (nrpages > NR_FIX_BTMAPS)
+ return NULL;
+
+ /*
+ * Ok, go for it..
+ */
+ idx = FIX_BTMAP_BEGIN;
+ while (nrpages > 0) {
+ __set_fixmap(idx, machine_addr,
+ __pgprot(__PAGE_KERNEL|_PAGE_IO));
+ machine_addr += PAGE_SIZE;
+ --idx;
+ --nrpages;
+ }
+
+ flush_tlb_all();
+
+ return (void*) (offset + fix_to_virt(FIX_BTMAP_BEGIN));
+}
+
+
+#if 0 /* We don't support these functions. They shouldn't be required. */
+void __init bt_iounmap(void *addr, unsigned long size) {}
+#endif
projects / xen.git / commitdiff