118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2018 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/kernel.h>
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#include <grub/misc.h>
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#include <grub/memory.h>
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#include <grub/mm.h>
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#include <grub/i386/cpuid.h>
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#include <grub/i386/io.h>
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#include <grub/xen.h>
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#include <xen/hvm/start_info.h>
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#include <grub/machine/kernel.h>
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grub_uint64_t grub_rsdp_addr;
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static char hypercall_page[GRUB_XEN_PAGE_SIZE]
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__attribute__ ((aligned (GRUB_XEN_PAGE_SIZE)));
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static grub_uint32_t xen_cpuid_base;
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static void
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grub_xen_cons_msg (const char *msg)
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{
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const char *c;
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for (c = msg; *c; c++)
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grub_outb (*c, XEN_HVM_DEBUGCONS_IOPORT);
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}
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static void
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grub_xen_panic (const char *msg)
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{
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grub_xen_cons_msg (msg);
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grub_xen_cons_msg ("System halted!\n");
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asm volatile ("cli");
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while (1)
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{
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asm volatile ("hlt");
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}
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}
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static void
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grub_xen_cpuid_base (void)
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{
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grub_uint32_t base, eax, signature[3];
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for (base = 0x40000000; base < 0x40010000; base += 0x100)
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{
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grub_cpuid (base, eax, signature[0], signature[1], signature[2]);
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if (!grub_memcmp ("XenVMMXenVMM", signature, 12) && (eax - base) >= 2)
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{
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xen_cpuid_base = base;
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return;
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}
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}
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grub_xen_panic ("Found no Xen signature!\n");
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}
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static void
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grub_xen_setup_hypercall_page (void)
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{
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grub_uint32_t msr, addr, eax, ebx, ecx, edx;
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/* Get base address of Xen-specific MSRs. */
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grub_cpuid (xen_cpuid_base + 2, eax, ebx, ecx, edx);
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msr = ebx;
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addr = (grub_uint32_t) (&hypercall_page);
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/* Specify hypercall page address for Xen. */
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asm volatile ("wrmsr" : : "c" (msr), "a" (addr), "d" (0) : "memory");
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}
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int
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grub_xen_hypercall (grub_uint32_t callno, grub_uint32_t a0,
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grub_uint32_t a1, grub_uint32_t a2,
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grub_uint32_t a3, grub_uint32_t a4,
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grub_uint32_t a5 __attribute__ ((unused)))
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{
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grub_uint32_t res;
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asm volatile ("call *%[callno]"
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: "=a" (res), "+b" (a0), "+c" (a1), "+d" (a2),
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"+S" (a3), "+D" (a4)
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: [callno] "a" (&hypercall_page[callno * 32])
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: "memory");
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return res;
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}
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void
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grub_xen_setup_pvh (void)
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{
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grub_xen_cpuid_base ();
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grub_xen_setup_hypercall_page ();
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}
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grub_err_t
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grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
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{
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}
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