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Diffstat (limited to 'tboot/include/paging.h')
| -rw-r--r-- | tboot/include/paging.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/tboot/include/paging.h b/tboot/include/paging.h new file mode 100644 index 0000000..7896824 --- /dev/null +++ b/tboot/include/paging.h @@ -0,0 +1,122 @@ +/* + * paging.h: Definitions for paging in tboot (PAE+PSE) + * + * Copyright (c) 2006-2010, Intel Corporation + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials provided + * with the distribution. + * * Neither the name of the Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#ifndef __PAGING_H__ +#define __PAGING_H__ + +/* direct map starts from 0, size 64M */ +#define DIRECTMAP_VIRT_START 0 +#define DIRECTMAP_VIRT_ORDER 26 +#define DIRECTMAP_VIRT_SIZE (1UL << DIRECTMAP_VIRT_ORDER) +#define DIRECTMAP_VIRT_END (DIRECTMAP_VIRT_START + DIRECTMAP_VIRT_SIZE) + +/* MAC window starts from 0x80000000, size 1G */ +#define MAC_VIRT_START 0x80000000 +#define MAC_VIRT_ORDER 30 +#define MAC_VIRT_SIZE (1UL << MAC_VIRT_ORDER) +#define MAC_VIRT_END (MAC_VIRT_START + MAC_VIRT_SIZE) + +/* PAE with 2-Mbyte Pages */ +#define TB_PAGETABLE_ORDER 9 +#define TB_L1_PAGETABLE_ENTRIES (1 << TB_PAGETABLE_ORDER) +#define TB_L2_PAGETABLE_ENTRIES (1 << TB_PAGETABLE_ORDER) + +#define TB_L1_PAGETABLE_SHIFT 21 +#define TB_L2_PAGETABLE_SHIFT 30 + +#define MAC_PAGE_SIZE (1UL << TB_L1_PAGETABLE_SHIFT) +#define MAC_PAGE_MASK (~(MAC_PAGE_SIZE - 1)) + +#define _PAGE_PRESENT 0x01 +#define _PAGE_RW 0x02 +#define _PAGE_SIZE 0x80 + + +#define MAKE_TB_PDE(paddr) \ + (((uint64_t)(paddr) & ~0x00000000001FFFFF) | _PAGE_PRESENT \ + | _PAGE_RW | _PAGE_SIZE) +#define MAKE_TB_PDPTE(paddr) \ + (((uint64_t)(paddr) & ~0x0000000000000FFF) | _PAGE_PRESENT) + +/* Given a virtual address, get an entry offset into a page table. */ +#define pd_table_offset(a) \ + (((a) >> TB_L1_PAGETABLE_SHIFT) & (TB_L1_PAGETABLE_ENTRIES - 1)) +#define pdptr_table_offset(a) \ + (((a) >> TB_L2_PAGETABLE_SHIFT) & (TB_L2_PAGETABLE_ENTRIES - 1)) + +/* PAE: 52 bit physical address */ +#define PADDR_BIT 52 +#define PADDR_MASK ((1ULL << PADDR_BIT) - 1) + +/* + * PDE entry + * 31-bit pfn = pde[51:21] + * 13-bit flags = pde[12:0] + */ +#define PDE_FLAG_BIT 13 +#define PDE_FLAG_MASK ((1UL << PDE_FLAG_BIT) - 1) +#define PDE_PADDR_MASK (PADDR_MASK & (~PDE_FLAG_MASK)) +#define get_pde_flags(pde) ((int)(pde) & PDE_FLAG_MASK) +#define get_pde_paddr(pde) ((pde) & PDE_PADDR_MASK) + +/* + * PDPTE entry + * 40-bit pfn = pdptre[51:12] + * 12-bit flags = pdptre[11:0] + */ +#define PDPTE_FLAG_BIT 12 +#define PDPTE_FLAG_MASK ((1UL << PDPTE_FLAG_BIT) - 1) +#define PDPTE_PADDR_MASK (PADDR_MASK & (~PDPTE_FLAG_MASK)) +#define get_pdptre_flags(pdptre) ((int)(pdptre) & PDPTE_FLAG_MASK) +#define get_pdptre_paddr(pdptre) ((pdptre) & PDPTE_PADDR_MASK) + +void map_pages_to_tboot(unsigned long vstart, + unsigned long pfn, + unsigned long nr_pfns); +void destroy_tboot_mapping(unsigned long vstart, unsigned long vend); +bool enable_paging(void); +bool disable_paging(void); + +#endif /* __PAGING_H__ */ + +/* + * Local variables: + * mode: C + * c-set-style: "BSD" + * c-basic-offset: 4 + * tab-width: 4 + * indent-tabs-mode: nil + * End: + */ |