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Ian Campbell
6993e9f5ce
# User Ian Campbell <ian.campbell@citrix.com> # Date 1282671421 -3600 # Node ID d1dd29a470ef1b9d2c77478a123326036dfe90bb # Parent d7a4adad9c328decbd384d87b23001aea8951b86 tools/libxc, tools/libelf: Relicense under LGPL v2.1 Relicense these two libraries under LGPL v2.1 only except where individual files already included the "or later" provision. Copyright holders have been contacted by Stephen Spector and have all agreed this change. Removed tools/libxc/ia64/aclinux.h since it appeared to be unused. There is a separate, more up to date, copy in xen/include/acpi/platform/aclinux.h which does appear to be used. Clarify the license of MiniOS privcmd.h under the same terms as other tools/include/xen-sys headers. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Stephen Spector <stephen.spector@citrix.com> Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
114 lines
3.7 KiB
C
114 lines
3.7 KiB
C
/******************************************************************************
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* xc_pagetab.c
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*
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* Function to translate virtual to physical addresses.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xc_private.h"
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#include <xen/hvm/save.h>
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#define CR0_PG 0x80000000
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#define CR4_PAE 0x20
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#define PTE_PSE 0x80
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#define EFER_LMA 0x400
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unsigned long xc_translate_foreign_address(xc_interface *xch, uint32_t dom,
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int vcpu, unsigned long long virt)
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{
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xc_dominfo_t dominfo;
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uint64_t paddr, mask, pte = 0;
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int size, level, pt_levels = 2;
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void *map;
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if (xc_domain_getinfo(xch, dom, 1, &dominfo) != 1
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|| dominfo.domid != dom)
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return 0;
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/* What kind of paging are we dealing with? */
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if (dominfo.hvm) {
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struct hvm_hw_cpu ctx;
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if (xc_domain_hvm_getcontext_partial(xch, dom,
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HVM_SAVE_CODE(CPU), vcpu,
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&ctx, sizeof ctx) != 0)
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return 0;
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if (!(ctx.cr0 & CR0_PG))
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return virt >> PAGE_SHIFT;
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pt_levels = (ctx.msr_efer&EFER_LMA) ? 4 : (ctx.cr4&CR4_PAE) ? 3 : 2;
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paddr = ctx.cr3 & ((pt_levels == 3) ? ~0x1full : ~0xfffull);
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} else {
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DECLARE_DOMCTL;
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vcpu_guest_context_any_t ctx;
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if (xc_vcpu_getcontext(xch, dom, vcpu, &ctx) != 0)
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return 0;
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domctl.domain = dom;
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domctl.cmd = XEN_DOMCTL_get_address_size;
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if ( do_domctl(xch, &domctl) != 0 )
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return 0;
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if (domctl.u.address_size.size == 64) {
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pt_levels = 4;
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paddr = ctx.x64.ctrlreg[3] & ~0xfffull;
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} else {
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pt_levels = 3;
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paddr = (((uint64_t) xen_cr3_to_pfn(ctx.x32.ctrlreg[3]))
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<< PAGE_SHIFT);
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}
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}
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if (pt_levels == 4) {
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virt &= 0x0000ffffffffffffull;
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mask = 0x0000ff8000000000ull;
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} else if (pt_levels == 3) {
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virt &= 0x00000000ffffffffull;
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mask = 0x0000007fc0000000ull;
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} else {
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virt &= 0x00000000ffffffffull;
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mask = 0x00000000ffc00000ull;
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}
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size = (pt_levels == 2 ? 4 : 8);
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/* Walk the pagetables */
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for (level = pt_levels; level > 0; level--) {
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paddr += ((virt & mask) >> (xc_ffs64(mask) - 1)) * size;
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map = xc_map_foreign_range(xch, dom, PAGE_SIZE, PROT_READ,
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paddr >>PAGE_SHIFT);
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if (!map)
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return 0;
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memcpy(&pte, map + (paddr & (PAGE_SIZE - 1)), size);
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munmap(map, PAGE_SIZE);
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if (!(pte & 1))
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return 0;
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paddr = pte & 0x000ffffffffff000ull;
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if (level == 2 && (pte & PTE_PSE)) {
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mask = ((mask ^ ~-mask) >> 1); /* All bits below first set bit */
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return ((paddr & ~mask) | (virt & mask)) >> PAGE_SHIFT;
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}
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mask >>= (pt_levels == 2 ? 10 : 9);
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}
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return paddr >> PAGE_SHIFT;
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}
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/*
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* Local variables:
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* mode: C
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* c-set-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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