/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the
+ * License may not be used to create, or enable the creation or
+ * redistribution of, unlawful or unlicensed copies of an Apple operating
+ * system, or to circumvent, violate, or enable the circumvention or
+ * violation of, any terms of an Apple operating system software license
+ * agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
*/
/*
* @OSF_COPYRIGHT@
#include <mach/i386/vm_param.h>
#include <kern/kern_types.h>
#include <kern/misc_protos.h>
+#include <sys/errno.h>
+#include <i386/param.h>
#include <i386/misc_protos.h>
+#include <i386/cpu_data.h>
+#include <i386/machine_routines.h>
+#include <i386/cpuid.h>
+#include <vm/pmap.h>
+#include <vm/vm_map.h>
+#include <vm/vm_kern.h>
+#include <vm/vm_fault.h>
- /*
- * Should be rewritten in asm anyway.
- */
+#include <libkern/OSAtomic.h>
+#include <sys/kdebug.h>
+#if 0
-/*
- * copy 'size' bytes from physical to physical address
- * the caller must validate the physical ranges
- *
- * if flush_action == 0, no cache flush necessary
- * if flush_action == 1, flush the source
- * if flush_action == 2, flush the dest
- * if flush_action == 3, flush both source and dest
- */
+#undef KERNEL_DEBUG
+#define KERNEL_DEBUG KERNEL_DEBUG_CONSTANT
+#define KDEBUG 1
-kern_return_t copyp2p(vm_offset_t source, vm_offset_t dest, unsigned int size, unsigned int flush_action) {
+#endif
- switch(flush_action) {
- case 1:
- flush_dcache(source, size, 1);
- break;
- case 2:
- flush_dcache(dest, size, 1);
- break;
- case 3:
- flush_dcache(source, size, 1);
- flush_dcache(dest, size, 1);
- break;
+/* XXX - should be gone from here */
+extern void invalidate_icache64(addr64_t addr, unsigned cnt, int phys);
+extern void flush_dcache64(addr64_t addr, unsigned count, int phys);
+extern boolean_t phys_page_exists(ppnum_t);
+extern void bcopy_no_overwrite(const char *from, char *to,vm_size_t bytes);
+extern void pmap_set_reference(ppnum_t pn);
+extern void mapping_set_mod(ppnum_t pa);
+extern void mapping_set_ref(ppnum_t pn);
- }
- bcopy_phys((char *)source, (char *)dest, size); /* Do a physical copy */
-
- switch(flush_action) {
- case 1:
- flush_dcache(source, size, 1);
- break;
- case 2:
- flush_dcache(dest, size, 1);
- break;
- case 3:
- flush_dcache(source, size, 1);
- flush_dcache(dest, size, 1);
- break;
+extern void fillPage(ppnum_t pa, unsigned int fill);
+extern void ovbcopy(const char *from,
+ char *to,
+ vm_size_t nbytes);
+void machine_callstack(natural_t *buf, vm_size_t callstack_max);
- }
-}
+#define value_64bit(value) ((value) & 0xFFFFFFFF00000000LL)
+#define low32(x) ((unsigned int)((x) & 0x00000000FFFFFFFFLL))
-/*
- * Copies data from a physical page to a virtual page. This is used to
- * move data from the kernel to user state.
- *
- */
+void
+bzero_phys(
+ addr64_t src64,
+ vm_size_t bytes)
+{
+ mapwindow_t *map;
+ pt_entry_t save;
+
+ mp_disable_preemption();
+ map = pmap_get_mapwindow((pt_entry_t)(INTEL_PTE_VALID | INTEL_PTE_RW | ((pmap_paddr_t)src64 & PG_FRAME) | INTEL_PTE_REF | INTEL_PTE_MOD));
+ if (map == 0) {
+ panic("bzero_phys: CMAP busy");
+ }
+ save = *map->prv_CMAP;
+
+ invlpg((uintptr_t)map->prv_CADDR);
+
+ bzero((void *)((uintptr_t)map->prv_CADDR | ((uint32_t)src64 & INTEL_OFFMASK)), bytes);
-kern_return_t
-copyp2v(char *from, char *to, unsigned int size) {
+ if (save != *map->prv_CMAP)
+ panic("bzero_phys: CMAP changed");
+ *map->prv_CMAP = 0;
- return(copyout(phystokv(from), to, size));
+ mp_enable_preemption();
}
+
/*
* bcopy_phys - like bcopy but copies from/to physical addresses.
- * this is trivial since all phys mem is mapped into
- * kernel virtual space
*/
void
-bcopy_phys(const char *from, char *to, vm_size_t bytes)
+bcopy_phys(
+ addr64_t src64,
+ addr64_t dst64,
+ vm_size_t bytes)
{
- bcopy((char *)phystokv(from), (char *)phystokv(to), bytes);
-}
+ mapwindow_t *src_map, *dst_map;
+ pt_entry_t save1, save2;
+
+ /* ensure we stay within a page */
+ if ( ((((uint32_t)src64 & (NBPG-1)) + bytes) > NBPG) || ((((uint32_t)dst64 & (NBPG-1)) + bytes) > NBPG) ) {
+ panic("bcopy_phys alignment");
+ }
+ mp_disable_preemption();
+
+ src_map = pmap_get_mapwindow((pt_entry_t)(INTEL_PTE_VALID | ((pmap_paddr_t)src64 & PG_FRAME) | INTEL_PTE_REF));
+ dst_map = pmap_get_mapwindow((pt_entry_t)(INTEL_PTE_VALID | INTEL_PTE_RW | ((pmap_paddr_t)dst64 & PG_FRAME) |
+ INTEL_PTE_REF | INTEL_PTE_MOD));
+
+ if (src_map == 0 || dst_map == 0) {
+ panic("bcopy_phys: CMAP busy");
+ }
+ save1 = *src_map->prv_CMAP;
+ save2 = *dst_map->prv_CMAP;
+
+ invlpg((uintptr_t)src_map->prv_CADDR);
+ invlpg((uintptr_t)dst_map->prv_CADDR);
+
+ bcopy((void *) ((uintptr_t)src_map->prv_CADDR | ((uint32_t)src64 & INTEL_OFFMASK)),
+ (void *) ((uintptr_t)dst_map->prv_CADDR | ((uint32_t)dst64 & INTEL_OFFMASK)), bytes);
+ if ( (save1 != *src_map->prv_CMAP) || (save2 != *dst_map->prv_CMAP))
+ panic("bcopy_phys CMAP changed");
+
+ *src_map->prv_CMAP = 0;
+ *dst_map->prv_CMAP = 0;
+
+ mp_enable_preemption();
+}
/*
* ovbcopy - like bcopy, but recognizes overlapping ranges and handles
}
}
-void
-bcopy(
- const char *from,
- char *to,
- vm_size_t bytes) /* num bytes to copy */
+
+/*
+ * Read data from a physical address. Memory should not be cache inhibited.
+ */
+
+
+static unsigned int
+ml_phys_read_data(pmap_paddr_t paddr, int size )
+{
+ mapwindow_t *map;
+ unsigned int result;
+ pt_entry_t save;
+
+ mp_disable_preemption();
+ map = pmap_get_mapwindow((pt_entry_t)(INTEL_PTE_VALID | (paddr & PG_FRAME) | INTEL_PTE_REF));
+ if (map == 0) {
+ panic("ml_phys_read_data: CMAP busy");
+ }
+
+ save = *map->prv_CMAP;
+ invlpg((uintptr_t)map->prv_CADDR);
+
+ switch (size) {
+ unsigned char s1;
+ unsigned short s2;
+ case 1:
+ s1 = *(unsigned char *)((uintptr_t)map->prv_CADDR | ((uint32_t)paddr & INTEL_OFFMASK));
+ result = s1;
+ break;
+ case 2:
+ s2 = *(unsigned short *)((uintptr_t)map->prv_CADDR | ((uint32_t)paddr & INTEL_OFFMASK));
+ result = s2;
+ break;
+ case 4:
+ default:
+ result = *(unsigned int *)((uintptr_t)map->prv_CADDR | ((uint32_t)paddr & INTEL_OFFMASK));
+ break;
+ }
+
+ if (save != *map->prv_CMAP)
+ panic("ml_phys_read_data CMAP changed");
+ *map->prv_CMAP = 0;
+ mp_enable_preemption();
+
+ return result;
+}
+
+static unsigned long long
+ml_phys_read_long_long(pmap_paddr_t paddr )
+{
+ mapwindow_t *map;
+ unsigned long long result;
+ pt_entry_t save;
+
+ mp_disable_preemption();
+ map = pmap_get_mapwindow((pt_entry_t)(INTEL_PTE_VALID | (paddr & PG_FRAME) | INTEL_PTE_REF));
+
+ if (map == 0) {
+ panic("ml_phys_read_long_long: CMAP busy");
+ }
+
+ save = *map->prv_CMAP;
+ invlpg((uintptr_t)map->prv_CADDR);
+
+ result = *(unsigned long long *)((uintptr_t)map->prv_CADDR | ((uint32_t)paddr & INTEL_OFFMASK));
+
+ if (save != *map->prv_CMAP)
+ panic("ml_phys_read_long_long CMAP changed");
+ *map->prv_CMAP = 0;
+ mp_enable_preemption();
+
+ return result;
+}
+
+
+
+unsigned int ml_phys_read(vm_offset_t paddr)
+{
+ return ml_phys_read_data((pmap_paddr_t)paddr, 4);
+}
+
+unsigned int ml_phys_read_word(vm_offset_t paddr) {
+
+ return ml_phys_read_data((pmap_paddr_t)paddr, 4);
+}
+
+unsigned int ml_phys_read_64(addr64_t paddr64)
+{
+ return ml_phys_read_data((pmap_paddr_t)paddr64, 4);
+}
+
+unsigned int ml_phys_read_word_64(addr64_t paddr64)
+{
+ return ml_phys_read_data((pmap_paddr_t)paddr64, 4);
+}
+
+unsigned int ml_phys_read_half(vm_offset_t paddr)
+{
+ return ml_phys_read_data((pmap_paddr_t)paddr, 2);
+}
+
+unsigned int ml_phys_read_half_64(addr64_t paddr64)
+{
+ return ml_phys_read_data((pmap_paddr_t)paddr64, 2);
+}
+
+unsigned int ml_phys_read_byte(vm_offset_t paddr)
+{
+ return ml_phys_read_data((pmap_paddr_t)paddr, 1);
+}
+
+unsigned int ml_phys_read_byte_64(addr64_t paddr64)
+{
+ return ml_phys_read_data((pmap_paddr_t)paddr64, 1);
+}
+
+unsigned long long ml_phys_read_double(vm_offset_t paddr)
+{
+ return ml_phys_read_long_long((pmap_paddr_t)paddr);
+}
+
+unsigned long long ml_phys_read_double_64(addr64_t paddr64)
+{
+ return ml_phys_read_long_long((pmap_paddr_t)paddr64);
+}
+
+
+
+/*
+ * Write data to a physical address. Memory should not be cache inhibited.
+ */
+
+static void
+ml_phys_write_data(pmap_paddr_t paddr, unsigned long data, int size)
+{
+ mapwindow_t *map;
+ pt_entry_t save;
+
+ mp_disable_preemption();
+ map = pmap_get_mapwindow((pt_entry_t)(INTEL_PTE_VALID | INTEL_PTE_RW | (paddr & PG_FRAME) |
+ INTEL_PTE_REF | INTEL_PTE_MOD));
+
+ if (map == 0) {
+ panic("ml_phys_write_data: CMAP busy");
+ }
+
+ save = *map->prv_CMAP;
+ invlpg((uintptr_t)map->prv_CADDR);
+
+ switch (size) {
+ case 1:
+ *(unsigned char *)((uintptr_t)map->prv_CADDR | ((uint32_t)paddr & INTEL_OFFMASK)) = (unsigned char)data;
+ break;
+ case 2:
+ *(unsigned short *)((uintptr_t)map->prv_CADDR | ((uint32_t)paddr & INTEL_OFFMASK)) = (unsigned short)data;
+ break;
+ case 4:
+ default:
+ *(unsigned int *)((uintptr_t)map->prv_CADDR | ((uint32_t)paddr & INTEL_OFFMASK)) = data;
+ break;
+ }
+
+ if (save != *map->prv_CMAP)
+ panic("ml_phys_write_data CMAP changed");
+ *map->prv_CMAP = 0;
+
+ mp_enable_preemption();
+}
+
+static void
+ml_phys_write_long_long(pmap_paddr_t paddr, unsigned long long data)
+{
+ mapwindow_t *map;
+ pt_entry_t save;
+
+ mp_disable_preemption();
+ map = pmap_get_mapwindow((pt_entry_t)(INTEL_PTE_VALID | INTEL_PTE_RW | (paddr & PG_FRAME) |
+ INTEL_PTE_REF | INTEL_PTE_MOD));
+ if (map == 0) {
+ panic("ml_phys_write_data: CMAP busy");
+ }
+
+ save = *map->prv_CMAP;
+ invlpg((uintptr_t)map->prv_CADDR);
+
+ *(unsigned long long *)((uintptr_t)map->prv_CADDR | ((uint32_t)paddr & INTEL_OFFMASK)) = data;
+
+ if (save != *map->prv_CMAP)
+ panic("ml_phys_write_data CMAP changed");
+ *map->prv_CMAP = 0;
+ mp_enable_preemption();
+}
+
+
+
+void ml_phys_write_byte(vm_offset_t paddr, unsigned int data)
+{
+ ml_phys_write_data((pmap_paddr_t)paddr, data, 1);
+}
+
+void ml_phys_write_byte_64(addr64_t paddr64, unsigned int data)
+{
+ ml_phys_write_data((pmap_paddr_t)paddr64, data, 1);
+}
+
+void ml_phys_write_half(vm_offset_t paddr, unsigned int data)
+{
+ ml_phys_write_data((pmap_paddr_t)paddr, data, 2);
+}
+
+void ml_phys_write_half_64(addr64_t paddr64, unsigned int data)
+{
+ ml_phys_write_data((pmap_paddr_t)paddr64, data, 2);
+}
+
+void ml_phys_write(vm_offset_t paddr, unsigned int data)
+{
+ ml_phys_write_data((pmap_paddr_t)paddr, data, 4);
+}
+
+void ml_phys_write_64(addr64_t paddr64, unsigned int data)
+{
+ ml_phys_write_data((pmap_paddr_t)paddr64, data, 4);
+}
+
+void ml_phys_write_word(vm_offset_t paddr, unsigned int data)
+{
+ ml_phys_write_data((pmap_paddr_t)paddr, data, 4);
+}
+
+void ml_phys_write_word_64(addr64_t paddr64, unsigned int data)
+{
+ ml_phys_write_data((pmap_paddr_t)paddr64, data, 4);
+}
+
+void ml_phys_write_double(vm_offset_t paddr, unsigned long long data)
{
- ovbcopy(from, to, bytes);
+ ml_phys_write_long_long((pmap_paddr_t)paddr, data);
}
+void ml_phys_write_double_64(addr64_t paddr64, unsigned long long data)
+{
+ ml_phys_write_long_long((pmap_paddr_t)paddr64, data);
+}
+
+
+/* PCI config cycle probing
+ *
+ *
+ * Read the memory location at physical address paddr.
+ * This is a part of a device probe, so there is a good chance we will
+ * have a machine check here. So we have to be able to handle that.
+ * We assume that machine checks are enabled both in MSR and HIDs
+ */
+
+boolean_t
+ml_probe_read(vm_offset_t paddr, unsigned int *val)
+{
+ *val = ml_phys_read((pmap_paddr_t)paddr);
+
+ return TRUE;
+}
+
+/*
+ * Read the memory location at physical address paddr.
+ * This is a part of a device probe, so there is a good chance we will
+ * have a machine check here. So we have to be able to handle that.
+ * We assume that machine checks are enabled both in MSR and HIDs
+ */
+boolean_t
+ml_probe_read_64(addr64_t paddr64, unsigned int *val)
+{
+ *val = ml_phys_read_64((pmap_paddr_t)paddr64);
+
+ return TRUE;
+}
+
+
int bcmp(
- const char *a,
- const char *b,
- vm_size_t len)
+ const void *pa,
+ const void *pb,
+ size_t len)
{
+ const char *a = (const char *)pa;
+ const char *b = (const char *)pb;
+
if (len == 0)
return 0;
int
memcmp(s1, s2, n)
- register char *s1, *s2;
- register n;
+ const void *s1, *s2;
+ size_t n;
{
- while (--n >= 0)
- if (*s1++ != *s2++)
- return (*--s1 - *--s2);
+ if (n != 0) {
+ const unsigned char *p1 = s1, *p2 = s2;
+
+ do {
+ if (*p1++ != *p2++)
+ return (*--p1 - *--p2);
+ } while (--n != 0);
+ }
return (0);
}
return string - 1 - ret;
}
-#include <libkern/OSAtomic.h>
-
uint32_t
hw_atomic_add(
uint32_t *dest,
* levels of return pc information.
*/
void machine_callstack(
- natural_t *buf,
- vm_size_t callstack_max)
+ __unused natural_t *buf,
+ __unused vm_size_t callstack_max)
{
}
#endif /* MACH_ASSERT */
+
+
+
+
+void fillPage(ppnum_t pa, unsigned int fill)
+{
+ mapwindow_t *map;
+ pmap_paddr_t src;
+ int i;
+ int cnt = PAGE_SIZE/sizeof(unsigned int);
+ unsigned int *addr;
+
+ mp_disable_preemption();
+ src = i386_ptob(pa);
+ map = pmap_get_mapwindow((pt_entry_t)(INTEL_PTE_VALID | INTEL_PTE_RW | (src & PG_FRAME) |
+ INTEL_PTE_REF | INTEL_PTE_MOD));
+ if (map == 0) {
+ panic("fillPage: CMAP busy");
+ }
+ invlpg((uintptr_t)map->prv_CADDR);
+
+ for (i = 0, addr = (unsigned int *)map->prv_CADDR; i < cnt ; i++ )
+ *addr++ = fill;
+
+ *map->prv_CMAP = 0;
+ mp_enable_preemption();
+}
+
+static inline void __sfence(void)
+{
+ __asm__ volatile("sfence");
+}
+static inline void __mfence(void)
+{
+ __asm__ volatile("mfence");
+}
+static inline void __wbinvd(void)
+{
+ __asm__ volatile("wbinvd");
+}
+static inline void __clflush(void *ptr)
+{
+ __asm__ volatile("clflush (%0)" : : "r" (ptr));
+}
+
+void dcache_incoherent_io_store64(addr64_t pa, unsigned int count)
+{
+ mapwindow_t *map;
+ uint32_t linesize = cpuid_info()->cache_linesize;
+ addr64_t addr;
+ uint32_t offset, chunk;
+ boolean_t istate;
+
+ __mfence();
+
+ istate = ml_set_interrupts_enabled(FALSE);
+
+ offset = pa & (linesize - 1);
+ addr = pa - offset;
+
+ map = pmap_get_mapwindow((pt_entry_t)(i386_ptob(atop_64(addr)) | INTEL_PTE_VALID));
+ if (map == 0) {
+ panic("cache_flush_page_phys: CMAP busy");
+ }
+
+ count += offset;
+ offset = addr & ((addr64_t) (page_size - 1));
+ chunk = page_size - offset;
+
+ do
+ {
+ if (chunk > count)
+ chunk = count;
+
+ *map->prv_CMAP = (pt_entry_t)(i386_ptob(atop_64(addr)) | INTEL_PTE_VALID);
+ invlpg((uintptr_t)map->prv_CADDR);
+
+ for (; offset < chunk; offset += linesize)
+ __clflush((void *)(((uintptr_t)map->prv_CADDR) + offset));
+
+ count -= chunk;
+ addr += chunk;
+ chunk = page_size;
+ offset = 0;
+ }
+ while (count);
+
+ *map->prv_CMAP = 0;
+
+ (void) ml_set_interrupts_enabled(istate);
+
+ __mfence();
+}
+
+void dcache_incoherent_io_flush64(addr64_t pa, unsigned int count)
+{
+ return(dcache_incoherent_io_store64(pa,count));
+}
+
+void
+flush_dcache64(__unused addr64_t addr,
+ __unused unsigned count,
+ __unused int phys)
+{
+}
+
+void
+invalidate_icache64(__unused addr64_t addr,
+ __unused unsigned count,
+ __unused int phys)
+{
+}
+
+
+addr64_t vm_last_addr;
+
+void
+mapping_set_mod(ppnum_t pn)
+{
+ pmap_set_modify(pn);
+}
+
+void
+mapping_set_ref(ppnum_t pn)
+{
+ pmap_set_reference(pn);
+}
+
+void
+cache_flush_page_phys(ppnum_t pa)
+{
+ mapwindow_t *map;
+ boolean_t istate;
+ int i;
+ unsigned char *cacheline_addr;
+ int cacheline_size = cpuid_info()->cache_linesize;
+ int cachelines_in_page = PAGE_SIZE/cacheline_size;
+
+ __mfence();
+
+ istate = ml_set_interrupts_enabled(FALSE);
+
+ map = pmap_get_mapwindow((pt_entry_t)(i386_ptob(pa) | INTEL_PTE_VALID));
+ if (map == 0) {
+ panic("cache_flush_page_phys: CMAP busy");
+ }
+
+ invlpg((uintptr_t)map->prv_CADDR);
+
+ for (i = 0, cacheline_addr = (unsigned char *)map->prv_CADDR;
+ i < cachelines_in_page;
+ i++, cacheline_addr += cacheline_size) {
+ __clflush((void *) cacheline_addr);
+ }
+
+ *map->prv_CMAP = 0;
+
+ (void) ml_set_interrupts_enabled(istate);
+
+ __mfence();
+}
+
+
+void exit_funnel_section(void)
+{
+ thread_t thread;
+
+ thread = current_thread();
+
+ if (thread->funnel_lock)
+ (void) thread_funnel_set(thread->funnel_lock, FALSE);
+}
+
+
+
+/*
+ * the copy engine has the following characteristics
+ * - copyio handles copies to/from user or kernel space
+ * - copypv deals with physical or virtual addresses
+ *
+ * implementation details as follows
+ * - a cache of up to NCOPY_WINDOWS is maintained per thread for
+ * access of user virutal space
+ * - the window size is determined by the amount of virtual space
+ * that can be mapped by a single page table
+ * - the mapping is done by copying the page table pointer from
+ * the user's directory entry corresponding to the window's
+ * address in user space to the directory entry corresponding
+ * to the window slot in the kernel's address space
+ * - the set of mappings is preserved across context switches,
+ * so the copy can run with pre-emption enabled
+ * - there is a gdt entry set up to anchor the kernel window on
+ * each processor
+ * - the copies are done using the selector corresponding to the
+ * gdt entry
+ * - the addresses corresponding to the user virtual address are
+ * relative to the beginning of the window being used to map
+ * that region... thus the thread can be pre-empted and switched
+ * to a different processor while in the midst of a copy
+ * - the window caches must be invalidated if the pmap changes out
+ * from under the thread... this can happen during vfork/exec...
+ * inval_copy_windows is the invalidation routine to be used
+ * - the copyio engine has 4 different states associated with it
+ * that allows for lazy tlb flushes and the ability to avoid
+ * a flush all together if we've just come from user space
+ * the 4 states are as follows...
+ *
+ * WINDOWS_OPENED - set by copyio to indicate to the context
+ * switch code that it is necessary to do a tlbflush after
+ * switching the windows since we're in the middle of a copy
+ *
+ * WINDOWS_CLOSED - set by copyio to indicate that it's done
+ * using the windows, so that the context switch code need
+ * not do the tlbflush... instead it will set the state to...
+ *
+ * WINDOWS_DIRTY - set by the context switch code to indicate
+ * to the copy engine that it is responsible for doing a
+ * tlbflush before using the windows again... it's also
+ * set by the inval_copy_windows routine to indicate the
+ * same responsibility.
+ *
+ * WINDOWS_CLEAN - set by the return to user path to indicate
+ * that a tlbflush has happened and that there is no need
+ * for copyio to do another when it is entered next...
+ *
+ * - a window for mapping single physical pages is provided for copypv
+ * - this window is maintained across context switches and has the
+ * same characteristics as the user space windows w/r to pre-emption
+ */
+
+extern int copyout_user(const char *, vm_offset_t, vm_size_t);
+extern int copyout_kern(const char *, vm_offset_t, vm_size_t);
+extern int copyin_user(const vm_offset_t, char *, vm_size_t);
+extern int copyin_kern(const vm_offset_t, char *, vm_size_t);
+extern int copyoutphys_user(const char *, vm_offset_t, vm_size_t);
+extern int copyoutphys_kern(const char *, vm_offset_t, vm_size_t);
+extern int copyinphys_user(const vm_offset_t, char *, vm_size_t);
+extern int copyinphys_kern(const vm_offset_t, char *, vm_size_t);
+extern int copyinstr_user(const vm_offset_t, char *, vm_size_t, vm_size_t *);
+extern int copyinstr_kern(const vm_offset_t, char *, vm_size_t, vm_size_t *);
+
+static int copyio(int, user_addr_t, char *, vm_size_t, vm_size_t *, int);
+static int copyio_phys(addr64_t, addr64_t, vm_size_t, int);
+
+
+#define COPYIN 0
+#define COPYOUT 1
+#define COPYINSTR 2
+#define COPYINPHYS 3
+#define COPYOUTPHYS 4
+
+
+
+void inval_copy_windows(thread_t thread)
+{
+ int i;
+
+ for (i = 0; i < NCOPY_WINDOWS; i++) {
+ thread->machine.copy_window[i].user_base = -1;
+ }
+ thread->machine.nxt_window = 0;
+ thread->machine.copyio_state = WINDOWS_DIRTY;
+
+ KERNEL_DEBUG(0xeff70058 | DBG_FUNC_NONE, (int)thread, (int)thread->map, 0, 0, 0);
+}
+
+
+static int
+copyio(int copy_type, user_addr_t user_addr, char *kernel_addr, vm_size_t nbytes, vm_size_t *lencopied, int use_kernel_map)
+{
+ thread_t thread;
+ pmap_t pmap;
+ pt_entry_t *updp;
+ pt_entry_t *kpdp;
+ user_addr_t user_base;
+ vm_offset_t user_offset;
+ vm_offset_t kern_vaddr;
+ vm_size_t cnt;
+ vm_size_t bytes_copied;
+ int error = 0;
+ int window_index;
+ int copyio_state;
+ boolean_t istate;
+#if KDEBUG
+ int debug_type = 0xeff70010;
+ debug_type += (copy_type << 2);
+#endif
+
+ thread = current_thread();
+
+ KERNEL_DEBUG(debug_type | DBG_FUNC_START, (int)(user_addr >> 32), (int)user_addr, (int)nbytes, thread->machine.copyio_state, 0);
+
+ if (nbytes == 0) {
+ KERNEL_DEBUG(debug_type | DBG_FUNC_END, (int)user_addr, (int)kernel_addr, (int)nbytes, 0, 0);
+ return (0);
+ }
+ pmap = thread->map->pmap;
+
+ if (pmap == kernel_pmap || use_kernel_map) {
+
+ kern_vaddr = (vm_offset_t)user_addr;
+
+ switch (copy_type) {
+
+ case COPYIN:
+ error = copyin_kern(kern_vaddr, kernel_addr, nbytes);
+ break;
+
+ case COPYOUT:
+ error = copyout_kern(kernel_addr, kern_vaddr, nbytes);
+ break;
+
+ case COPYINSTR:
+ error = copyinstr_kern(kern_vaddr, kernel_addr, nbytes, lencopied);
+ break;
+
+ case COPYINPHYS:
+ error = copyinphys_kern(kern_vaddr, kernel_addr, nbytes);
+ break;
+
+ case COPYOUTPHYS:
+ error = copyoutphys_kern(kernel_addr, kern_vaddr, nbytes);
+ break;
+ }
+ KERNEL_DEBUG(debug_type | DBG_FUNC_END, (int)kern_vaddr, (int)kernel_addr, (int)nbytes, error | 0x80000000, 0);
+
+ return (error);
+ }
+ user_base = user_addr & ~((user_addr_t)(NBPDE - 1));
+ user_offset = user_addr & (NBPDE - 1);
+
+ KERNEL_DEBUG(debug_type | DBG_FUNC_NONE, (int)(user_base >> 32), (int)user_base, (int)user_offset, 0, 0);
+
+ cnt = NBPDE - user_offset;
+
+ if (cnt > nbytes)
+ cnt = nbytes;
+
+ istate = ml_set_interrupts_enabled(FALSE);
+
+ copyio_state = thread->machine.copyio_state;
+ thread->machine.copyio_state = WINDOWS_OPENED;
+
+ (void) ml_set_interrupts_enabled(istate);
+
+
+ for (;;) {
+
+ for (window_index = 0; window_index < NCOPY_WINDOWS; window_index++) {
+ if (thread->machine.copy_window[window_index].user_base == user_base)
+ break;
+ }
+ if (window_index >= NCOPY_WINDOWS) {
+
+ window_index = thread->machine.nxt_window;
+ thread->machine.nxt_window++;
+
+ if (thread->machine.nxt_window >= NCOPY_WINDOWS)
+ thread->machine.nxt_window = 0;
+ thread->machine.copy_window[window_index].user_base = user_base;
+
+ /*
+ * it's necessary to disable pre-emption
+ * since I have to compute the kernel descriptor pointer
+ * for the new window
+ */
+ istate = ml_set_interrupts_enabled(FALSE);
+
+ updp = pmap_pde(pmap, user_base);
+
+ kpdp = current_cpu_datap()->cpu_copywindow_pdp;
+ kpdp += window_index;
+
+ pmap_store_pte(kpdp, updp ? *updp : 0);
+
+ (void) ml_set_interrupts_enabled(istate);
+
+ copyio_state = WINDOWS_DIRTY;
+
+ KERNEL_DEBUG(0xeff70040 | DBG_FUNC_NONE, window_index, (int)user_base, (int)updp, (int)kpdp, 0);
+
+ }
+#if JOE_DEBUG
+ else {
+ updp = pmap_pde(pmap, user_base);
+
+ istate = ml_set_interrupts_enabled(FALSE);
+
+ kpdp = current_cpu_datap()->cpu_copywindow_pdp;
+
+ kpdp += window_index;
+
+ if ((*kpdp & PG_FRAME) != (*updp & PG_FRAME)) {
+ panic("copyio: user pdp mismatch - kpdp = 0x%x, updp = 0x%x\n", kpdp, updp);
+ }
+ (void) ml_set_interrupts_enabled(istate);
+ }
+#endif
+ if (copyio_state == WINDOWS_DIRTY) {
+ flush_tlb();
+
+ copyio_state = WINDOWS_CLEAN;
+
+ KERNEL_DEBUG(0xeff70054 | DBG_FUNC_NONE, window_index, 0, 0, 0, 0);
+ }
+ user_offset += (window_index * NBPDE);
+
+ KERNEL_DEBUG(0xeff70044 | DBG_FUNC_NONE, (int)user_offset, (int)kernel_addr, cnt, 0, 0);
+
+ switch (copy_type) {
+
+ case COPYIN:
+ error = copyin_user(user_offset, kernel_addr, cnt);
+ break;
+
+ case COPYOUT:
+ error = copyout_user(kernel_addr, user_offset, cnt);
+ break;
+
+ case COPYINPHYS:
+ error = copyinphys_user(user_offset, kernel_addr, cnt);
+ break;
+
+ case COPYOUTPHYS:
+ error = copyoutphys_user(kernel_addr, user_offset, cnt);
+ break;
+
+ case COPYINSTR:
+ error = copyinstr_user(user_offset, kernel_addr, cnt, &bytes_copied);
+
+ /*
+ * lencopied should be updated on success
+ * or ENAMETOOLONG... but not EFAULT
+ */
+ if (error != EFAULT)
+ *lencopied += bytes_copied;
+
+ /*
+ * if we still have room, then the ENAMETOOLONG
+ * is just an artifact of the buffer straddling
+ * a window boundary and we should continue
+ */
+ if (error == ENAMETOOLONG && nbytes > cnt)
+ error = 0;
+
+ if (error) {
+#if KDEBUG
+ nbytes = *lencopied;
+#endif
+ break;
+ }
+ if (*(kernel_addr + bytes_copied - 1) == 0) {
+ /*
+ * we found a NULL terminator... we're done
+ */
+#if KDEBUG
+ nbytes = *lencopied;
+#endif
+ goto done;
+ }
+ if (cnt == nbytes) {
+ /*
+ * no more room in the buffer and we haven't
+ * yet come across a NULL terminator
+ */
+#if KDEBUG
+ nbytes = *lencopied;
+#endif
+ error = ENAMETOOLONG;
+ break;
+ }
+ assert(cnt == bytes_copied);
+
+ break;
+ }
+ if (error)
+ break;
+ if ((nbytes -= cnt) == 0)
+ break;
+
+ kernel_addr += cnt;
+ user_base += NBPDE;
+ user_offset = 0;
+
+ if (nbytes > NBPDE)
+ cnt = NBPDE;
+ else
+ cnt = nbytes;
+ }
+done:
+ thread->machine.copyio_state = WINDOWS_CLOSED;
+
+ KERNEL_DEBUG(debug_type | DBG_FUNC_END, (int)user_addr, (int)kernel_addr, (int)nbytes, error, 0);
+
+ return (error);
+}
+
+
+static int
+copyio_phys(addr64_t source, addr64_t sink, vm_size_t csize, int which)
+{
+ pmap_paddr_t paddr;
+ user_addr_t vaddr;
+ char *window_offset;
+ pt_entry_t pentry;
+ int ctype;
+ int retval;
+ boolean_t istate;
+
+ if (which & cppvPsnk) {
+ paddr = (pmap_paddr_t)sink;
+ vaddr = (user_addr_t)source;
+ ctype = COPYINPHYS;
+ pentry = (pt_entry_t)(INTEL_PTE_VALID | (paddr & PG_FRAME) | INTEL_PTE_RW);
+ } else {
+ paddr = (pmap_paddr_t)source;
+ vaddr = (user_addr_t)sink;
+ ctype = COPYOUTPHYS;
+ pentry = (pt_entry_t)(INTEL_PTE_VALID | (paddr & PG_FRAME));
+ }
+ window_offset = (char *)((uint32_t)paddr & (PAGE_SIZE - 1));
+
+ if (current_thread()->machine.physwindow_busy) {
+ pt_entry_t old_pentry;
+
+ KERNEL_DEBUG(0xeff70048 | DBG_FUNC_NONE, paddr, csize, 0, -1, 0);
+ /*
+ * we had better be targeting wired memory at this point
+ * we will not be able to handle a fault with interrupts
+ * disabled... we disable them because we can't tolerate
+ * being preempted during this nested use of the window
+ */
+ istate = ml_set_interrupts_enabled(FALSE);
+
+ old_pentry = *(current_cpu_datap()->cpu_physwindow_ptep);
+ pmap_store_pte((current_cpu_datap()->cpu_physwindow_ptep), pentry);
+
+ invlpg((uintptr_t)current_cpu_datap()->cpu_physwindow_base);
+
+ retval = copyio(ctype, vaddr, window_offset, csize, NULL, which & cppvKmap);
+
+ pmap_store_pte((current_cpu_datap()->cpu_physwindow_ptep), old_pentry);
+
+ invlpg((uintptr_t)current_cpu_datap()->cpu_physwindow_base);
+
+ (void) ml_set_interrupts_enabled(istate);
+ } else {
+ /*
+ * mark the window as in use... if an interrupt hits while we're
+ * busy, or we trigger another coyppv from the fault path into
+ * the driver on a user address space page fault due to a copyin/out
+ * then we need to save and restore the current window state instead
+ * of caching the window preserving it across context switches
+ */
+ current_thread()->machine.physwindow_busy = 1;
+
+ if (current_thread()->machine.physwindow_pte != pentry) {
+ KERNEL_DEBUG(0xeff70048 | DBG_FUNC_NONE, paddr, csize, 0, 0, 0);
+
+ current_thread()->machine.physwindow_pte = pentry;
+
+ /*
+ * preemption at this point would be bad since we
+ * could end up on the other processor after we grabbed the
+ * pointer to the current cpu data area, but before we finished
+ * using it to stuff the page table entry since we would
+ * be modifying a window that no longer belonged to us
+ * the invlpg can be done unprotected since it only flushes
+ * this page address from the tlb... if it flushes the wrong
+ * one, no harm is done, and the context switch that moved us
+ * to the other processor will have already take care of
+ * flushing the tlb after it reloaded the page table from machine.physwindow_pte
+ */
+ istate = ml_set_interrupts_enabled(FALSE);
+ *(current_cpu_datap()->cpu_physwindow_ptep) = pentry;
+ (void) ml_set_interrupts_enabled(istate);
+
+ invlpg((uintptr_t)current_cpu_datap()->cpu_physwindow_base);
+ }
+#if JOE_DEBUG
+ else {
+ if (pentry !=
+ (*(current_cpu_datap()->cpu_physwindow_ptep) & (INTEL_PTE_VALID | PG_FRAME | INTEL_PTE_RW)))
+ panic("copyio_phys: pentry != *physwindow_ptep");
+ }
+#endif
+ retval = copyio(ctype, vaddr, window_offset, csize, NULL, which & cppvKmap);
+
+ current_thread()->machine.physwindow_busy = 0;
+ }
+ return (retval);
+}
+
+
+
+int
+copyinmsg(const user_addr_t user_addr, char *kernel_addr, vm_size_t nbytes)
+{
+ return (copyio(COPYIN, user_addr, kernel_addr, nbytes, NULL, 0));
+}
+
+int
+copyin(const user_addr_t user_addr, char *kernel_addr, vm_size_t nbytes)
+{
+ return (copyio(COPYIN, user_addr, kernel_addr, nbytes, NULL, 0));
+}
+
+int
+copyinstr(const user_addr_t user_addr, char *kernel_addr, vm_size_t nbytes, vm_size_t *lencopied)
+{
+ *lencopied = 0;
+
+ return (copyio(COPYINSTR, user_addr, kernel_addr, nbytes, lencopied, 0));
+}
+
+int
+copyoutmsg(const char *kernel_addr, user_addr_t user_addr, vm_size_t nbytes)
+{
+ return (copyio(COPYOUT, user_addr, (char *)kernel_addr, nbytes, NULL, 0));
+}
+
+int
+copyout(const char *kernel_addr, user_addr_t user_addr, vm_size_t nbytes)
+{
+ return (copyio(COPYOUT, user_addr, (char *)kernel_addr, nbytes, NULL, 0));
+}
+
+
+kern_return_t copypv(addr64_t src64, addr64_t snk64, unsigned int size, int which)
+{
+ unsigned int lop, csize;
+ int bothphys = 0;
+
+
+ KERNEL_DEBUG(0xeff7004c | DBG_FUNC_START, (int)src64, (int)snk64, size, which, 0);
+
+ if ((which & (cppvPsrc | cppvPsnk)) == 0 ) /* Make sure that only one is virtual */
+ panic("copypv: no more than 1 parameter may be virtual\n"); /* Not allowed */
+
+ if ((which & (cppvPsrc | cppvPsnk)) == (cppvPsrc | cppvPsnk))
+ bothphys = 1; /* both are physical */
+
+ while (size) {
+
+ if (bothphys) {
+ lop = (unsigned int)(PAGE_SIZE - (snk64 & (PAGE_SIZE - 1))); /* Assume sink smallest */
+
+ if (lop > (unsigned int)(PAGE_SIZE - (src64 & (PAGE_SIZE - 1))))
+ lop = (unsigned int)(PAGE_SIZE - (src64 & (PAGE_SIZE - 1))); /* No, source is smaller */
+ } else {
+ /*
+ * only need to compute the resid for the physical page
+ * address... we don't care about where we start/finish in
+ * the virtual since we just call the normal copyin/copyout
+ */
+ if (which & cppvPsrc)
+ lop = (unsigned int)(PAGE_SIZE - (src64 & (PAGE_SIZE - 1)));
+ else
+ lop = (unsigned int)(PAGE_SIZE - (snk64 & (PAGE_SIZE - 1)));
+ }
+ csize = size; /* Assume we can copy it all */
+ if (lop < size)
+ csize = lop; /* Nope, we can't do it all */
+#if 0
+ /*
+ * flush_dcache64 is currently a nop on the i386...
+ * it's used when copying to non-system memory such
+ * as video capture cards... on PPC there was a need
+ * to flush due to how we mapped this memory... not
+ * sure if it's needed on i386.
+ */
+ if (which & cppvFsrc)
+ flush_dcache64(src64, csize, 1); /* If requested, flush source before move */
+ if (which & cppvFsnk)
+ flush_dcache64(snk64, csize, 1); /* If requested, flush sink before move */
+#endif
+ if (bothphys)
+ bcopy_phys(src64, snk64, csize); /* Do a physical copy, virtually */
+ else {
+ if (copyio_phys(src64, snk64, csize, which))
+ return (KERN_FAILURE);
+ }
+#if 0
+ if (which & cppvFsrc)
+ flush_dcache64(src64, csize, 1); /* If requested, flush source after move */
+ if (which & cppvFsnk)
+ flush_dcache64(snk64, csize, 1); /* If requested, flush sink after move */
+#endif
+ size -= csize; /* Calculate what is left */
+ snk64 += csize; /* Bump sink to next physical address */
+ src64 += csize; /* Bump source to next physical address */
+ }
+ KERNEL_DEBUG(0xeff7004c | DBG_FUNC_END, (int)src64, (int)snk64, size, which, 0);
+
+ return KERN_SUCCESS;
+}
projects / apple / xnu.git / blobdiff