[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 1/2] x86: construct static parts of 1:1 mapping at build time
... rather than at boot time, removing unnecessary redundancy between EFI and legacy boot code. Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> --- a/xen/arch/x86/boot/head.S +++ b/xen/arch/x86/boot/head.S @@ -124,14 +124,11 @@ __start: bt $29,%edx jnc bad_cpu /* Initialise L2 identity-map and xen page table entries (16MB). */ - mov $sym_phys(l2_identmap),%edi mov $sym_phys(l2_xenmap),%esi mov $sym_phys(l2_bootmap),%edx mov $0x1e3,%eax /* PRESENT+RW+A+D+2MB+GLOBAL */ mov $8,%ecx -1: mov %eax,(%edi) - add $8,%edi - mov %eax,(%esi) +1: mov %eax,(%esi) add $8,%esi mov %eax,(%edx) add $8,%edx @@ -163,54 +160,11 @@ __start: mov %eax,sym_phys(idle_pg_table) + l4_table_offset(DIRECTMAP_VIRT_START)*8 mov $(sym_phys(l3_xenmap)+7),%eax mov %eax,sym_phys(idle_pg_table) + l4_table_offset(XEN_VIRT_START)*8 -#else - /* Initialize low and high mappings of memory with 2MB pages */ - mov $sym_phys(idle_pg_table_l2),%edi - mov $0xe3,%eax /* PRESENT+RW+A+D+2MB */ -1: mov %eax,__PAGE_OFFSET>>18(%edi) /* high mapping */ - stosl /* low mapping */ - add $4,%edi - add $(1<<L2_PAGETABLE_SHIFT),%eax - cmp $DIRECTMAP_PHYS_END+0xe3,%eax - jne 1b -1: stosl /* low mappings cover up to 16MB */ - add $4,%edi - add $(1<<L2_PAGETABLE_SHIFT),%eax - cmp $(16<<20)+0xe3,%eax - jne 1b - /* Initialise L2 fixmap page directory entry. */ - mov $(sym_phys(l1_fixmap)+7),%eax - mov %eax,sym_phys(idle_pg_table_l2) + l2_table_offset(FIXADDR_TOP-1)*8 -#endif - - /* Initialize 4kB mappings of first 2MB or 4MB of memory. */ - mov $sym_phys(l1_identmap),%edi - mov $0x263,%eax /* PRESENT+RW+A+D+SMALL_PAGES */ -#if defined(__x86_64__) - or $0x100,%eax /* GLOBAL */ -#endif - xor %ecx,%ecx -1: stosl - add $4,%edi - add $PAGE_SIZE,%eax - inc %ecx - /* VGA hole (0xa0000-0xc0000) should be mapped UC. */ - cmp $0xa0,%ecx - jne 2f - or $0x10,%eax /* +PCD */ -2: cmp $0xc0,%ecx - jne 2f - and $~0x10,%eax /* -PCD */ -2: cmp $L1_PAGETABLE_ENTRIES,%ecx - jne 1b - sub $(PAGE_SIZE-0x63),%edi -#if defined(__x86_64__) + /* Hook 4kB mappings of first 2MB of memory into L2. */ + mov $sym_phys(l1_identmap)+__PAGE_HYPERVISOR,%edi mov %edi,sym_phys(l2_identmap) mov %edi,sym_phys(l2_xenmap) mov %edi,sym_phys(l2_bootmap) -#else - mov %edi,sym_phys(idle_pg_table_l2) - mov %edi,sym_phys(idle_pg_table_l2) + (__PAGE_OFFSET>>18) #endif /* Apply relocations to bootstrap trampoline. */ @@ -269,3 +223,25 @@ __high_start: #else #include "x86_32.S" #endif + + .section .data.page_aligned, "aw", @progbits + .p2align PAGE_SHIFT +/* + * Mapping of first 2 megabytes of memory. This is mapped with 4kB mappings + * to avoid type conflicts with fixed-range MTRRs covering the lowest megabyte + * of physical memory. In any case the VGA hole should be mapped with type UC. + */ + .globl l1_identmap +l1_identmap: + pfn = 0 + .rept L1_PAGETABLE_ENTRIES + /* VGA hole (0xa0000-0xc0000) should be mapped UC. */ + .if pfn >= 0xa0 && pfn < 0xc0 + .long (pfn << PAGE_SHIFT) | PAGE_HYPERVISOR_NOCACHE | MAP_SMALL_PAGES + .else + .long (pfn << PAGE_SHIFT) | PAGE_HYPERVISOR | MAP_SMALL_PAGES + .endif + .long 0 + pfn = pfn + 1 + .endr + .size l1_identmap, . - l1_identmap --- a/xen/arch/x86/boot/x86_32.S +++ b/xen/arch/x86/boot/x86_32.S @@ -108,3 +108,24 @@ ENTRY(boot_cpu_gdt_table) .fill (PER_CPU_GDT_ENTRY - FLAT_RING3_DS / 8 - 1), 8, 0 .quad 0x0000910000000000 /* per-CPU entry (limit == cpu) */ .align PAGE_SIZE,0 + +#define PAGE_HYPERVISOR __PAGE_HYPERVISOR +#define PAGE_HYPERVISOR_NOCACHE __PAGE_HYPERVISOR_NOCACHE + +/* Mapping of first 16 megabytes of memory. */ + .globl idle_pg_table_l2 +idle_pg_table_l2: + range = 8 + .irp count, l2_linear_offset(__PAGE_OFFSET), \ + (4 * L2_PAGETABLE_ENTRIES - l2_linear_offset(__PAGE_OFFSET) - 1) + .long sym_phys(l1_identmap) + PAGE_HYPERVISOR, 0 + pfn = 1 << PAGETABLE_ORDER + .rept range - 1 + .long (pfn << PAGE_SHIFT) | PAGE_HYPERVISOR | _PAGE_PSE, 0 + pfn = pfn + (1 << PAGETABLE_ORDER) + .endr + .fill \count - range, 8, 0 + range = DIRECTMAP_MBYTES / 2 + .endr + .long sym_phys(l1_fixmap) + PAGE_HYPERVISOR, 0 + .size idle_pg_table_l2, . - idle_pg_table_l2 --- a/xen/arch/x86/boot/x86_64.S +++ b/xen/arch/x86/boot/x86_64.S @@ -127,3 +127,15 @@ ENTRY(boot_cpu_compat_gdt_table) .fill (PER_CPU_GDT_ENTRY - __HYPERVISOR_CS32 / 8 - 1), 8, 0 .quad 0x0000910000000000 /* per-CPU entry (limit == cpu) */ .align PAGE_SIZE, 0 + +/* Mapping of first 16 megabytes of memory. */ + .globl l2_identmap +l2_identmap: + .quad 0 + pfn = 0 + .rept 7 + pfn = pfn + (1 << PAGETABLE_ORDER) + .quad (pfn << PAGE_SHIFT) | PAGE_HYPERVISOR | _PAGE_PSE + .endr + .fill 4 * L2_PAGETABLE_ENTRIES - 8, 8, 0 + .size l2_identmap, . - l2_identmap --- a/xen/arch/x86/efi/boot.c +++ b/xen/arch/x86/efi/boot.c @@ -1119,8 +1119,6 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SY unsigned int slot = (xen_phys_start >> L2_PAGETABLE_SHIFT) + i; paddr_t addr = slot << L2_PAGETABLE_SHIFT; - l2_identmap[i] = l2e_from_paddr(i << L2_PAGETABLE_SHIFT, - PAGE_HYPERVISOR|_PAGE_PSE); l2_identmap[slot] = l2e_from_paddr(addr, PAGE_HYPERVISOR|_PAGE_PSE); l2_xenmap[i] = l2e_from_paddr(addr, PAGE_HYPERVISOR|_PAGE_PSE); slot &= L2_PAGETABLE_ENTRIES - 1; @@ -1150,16 +1148,7 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SY l4e_from_paddr((UINTN)l3_identmap, __PAGE_HYPERVISOR); idle_pg_table[l4_table_offset(XEN_VIRT_START)] = l4e_from_paddr((UINTN)l3_xenmap, __PAGE_HYPERVISOR); - /* Initialize 4kB mappings of first 2MB of memory. */ - for ( i = 0; i < L1_PAGETABLE_ENTRIES; ++i ) - { - unsigned int attr = PAGE_HYPERVISOR|MAP_SMALL_PAGES; - - /* VGA hole (0xa0000-0xc0000) should be mapped UC. */ - if ( i >= 0xa0 && i < 0xc0 ) - attr |= _PAGE_PCD; - l1_identmap[i] = l1e_from_pfn(i, attr); - } + /* Hook 4kB mappings of first 2MB of memory into L2. */ l2_identmap[0] = l2e_from_paddr((UINTN)l1_identmap, __PAGE_HYPERVISOR); if ( gop ) --- a/xen/arch/x86/mm.c +++ b/xen/arch/x86/mm.c @@ -121,15 +121,6 @@ #include <asm/setup.h> #include <asm/fixmap.h> -/* - * Mapping of first 2 or 4 megabytes of memory. This is mapped with 4kB - * mappings to avoid type conflicts with fixed-range MTRRs covering the - * lowest megabyte of physical memory. In any case the VGA hole should be - * mapped with type UC. - */ -l1_pgentry_t __attribute__ ((__section__ (".bss.page_aligned"))) - l1_identmap[L1_PAGETABLE_ENTRIES]; - /* Mapping of the fixmap space needed early. */ l1_pgentry_t __attribute__ ((__section__ (".bss.page_aligned"))) l1_fixmap[L1_PAGETABLE_ENTRIES]; --- a/xen/arch/x86/x86_32/mm.c +++ b/xen/arch/x86/x86_32/mm.c @@ -31,9 +31,6 @@ #include <asm/setup.h> #include <public/memory.h> -l2_pgentry_t __attribute__ ((__section__ (".bss.page_aligned"))) - idle_pg_table_l2[4 * L2_PAGETABLE_ENTRIES]; - unsigned int __read_mostly PAGE_HYPERVISOR = __PAGE_HYPERVISOR; unsigned int __read_mostly PAGE_HYPERVISOR_NOCACHE = __PAGE_HYPERVISOR_NOCACHE; --- a/xen/arch/x86/x86_64/mm.c +++ b/xen/arch/x86/x86_64/mm.c @@ -56,8 +56,6 @@ l4_pgentry_t __attribute__ ((__section__ /* Enough page directories to map bottom 4GB of the memory map. */ l3_pgentry_t __attribute__ ((__section__ (".bss.page_aligned"))) l3_identmap[L3_PAGETABLE_ENTRIES]; -l2_pgentry_t __attribute__ ((__section__ (".bss.page_aligned"))) - l2_identmap[4*L2_PAGETABLE_ENTRIES]; /* Enough page directories to map the Xen text and static data. */ l3_pgentry_t __attribute__ ((__section__ (".bss.page_aligned"))) --- a/xen/include/asm-x86/page.h +++ b/xen/include/asm-x86/page.h @@ -1,15 +1,13 @@ #ifndef __X86_PAGE_H__ #define __X86_PAGE_H__ +#include <xen/const.h> + /* * It is important that the masks are signed quantities. This ensures that * the compiler sign-extends a 32-bit mask to 64 bits if that is required. */ -#ifndef __ASSEMBLY__ -#define PAGE_SIZE (1L << PAGE_SHIFT) -#else -#define PAGE_SIZE (1 << PAGE_SHIFT) -#endif +#define PAGE_SIZE (_AC(1,L) << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE-1)) #define PAGE_FLAG_MASK (~0) @@ -319,21 +317,22 @@ void paging_init(void); void setup_idle_pagetable(void); #endif /* !defined(__ASSEMBLY__) */ -#define _PAGE_PRESENT 0x001U -#define _PAGE_RW 0x002U -#define _PAGE_USER 0x004U -#define _PAGE_PWT 0x008U -#define _PAGE_PCD 0x010U -#define _PAGE_ACCESSED 0x020U -#define _PAGE_DIRTY 0x040U -#define _PAGE_PAT 0x080U -#define _PAGE_PSE 0x080U -#define _PAGE_GLOBAL 0x100U -#define _PAGE_AVAIL0 0x200U -#define _PAGE_AVAIL1 0x400U -#define _PAGE_AVAIL2 0x800U -#define _PAGE_AVAIL 0xE00U -#define _PAGE_PSE_PAT 0x1000U +#define _PAGE_PRESENT _AC(0x001,U) +#define _PAGE_RW _AC(0x002,U) +#define _PAGE_USER _AC(0x004,U) +#define _PAGE_PWT _AC(0x008,U) +#define _PAGE_PCD _AC(0x010,U) +#define _PAGE_ACCESSED _AC(0x020,U) +#define _PAGE_DIRTY _AC(0x040,U) +#define _PAGE_PAT _AC(0x080,U) +#define _PAGE_PSE _AC(0x080,U) +#define _PAGE_GLOBAL _AC(0x100,U) +#define _PAGE_AVAIL0 _AC(0x200,U) +#define _PAGE_AVAIL1 _AC(0x400,U) +#define _PAGE_AVAIL2 _AC(0x800,U) +#define _PAGE_AVAIL _AC(0xE00,U) +#define _PAGE_PSE_PAT _AC(0x1000,U) +/* non-architectural flags */ #define _PAGE_PAGED 0x2000U #define _PAGE_SHARED 0x4000U @@ -354,6 +353,8 @@ void setup_idle_pagetable(void); #define __PAGE_HYPERVISOR_NOCACHE \ (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_PCD | _PAGE_ACCESSED) +#define MAP_SMALL_PAGES _PAGE_AVAIL0 /* don't use superpages mappings */ + #ifndef __ASSEMBLY__ /* Allocator functions for Xen pagetables. */ @@ -367,7 +368,6 @@ l3_pgentry_t *virt_to_xen_l3e(unsigned l extern void set_pdx_range(unsigned long smfn, unsigned long emfn); /* Map machine page range in Xen virtual address space. */ -#define MAP_SMALL_PAGES _PAGE_AVAIL0 /* don't use superpages for the mapping */ int map_pages_to_xen( unsigned long virt, unsigned long mfn, Attachment:
x86-build-ident-map.patch _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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