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/*
* Copyright (C) 2016 Veertu Inc,
* Copyright (C) 2017 Google Inc,
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "vmx.h"
#include "x86_descr.h"
#define VMX_SEGMENT_FIELD(seg) \
[R_##seg] = { \
.selector = VMCS_GUEST_##seg##_SELECTOR, \
.base = VMCS_GUEST_##seg##_BASE, \
.limit = VMCS_GUEST_##seg##_LIMIT, \
.ar_bytes = VMCS_GUEST_##seg##_ACCESS_RIGHTS, \
}
static const struct vmx_segment_field {
int selector;
int base;
int limit;
int ar_bytes;
} vmx_segment_fields[] = {
VMX_SEGMENT_FIELD(ES),
VMX_SEGMENT_FIELD(CS),
VMX_SEGMENT_FIELD(SS),
VMX_SEGMENT_FIELD(DS),
VMX_SEGMENT_FIELD(FS),
VMX_SEGMENT_FIELD(GS),
VMX_SEGMENT_FIELD(LDTR),
VMX_SEGMENT_FIELD(TR),
};
uint32_t vmx_read_segment_limit(CPUState *cpu, X86Seg seg)
{
return (uint32_t)rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].limit);
}
uint32_t vmx_read_segment_ar(CPUState *cpu, X86Seg seg)
{
return (uint32_t)rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].ar_bytes);
}
uint64_t vmx_read_segment_base(CPUState *cpu, X86Seg seg)
{
return rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].base);
}
x68_segment_selector vmx_read_segment_selector(CPUState *cpu, X86Seg seg)
{
x68_segment_selector sel;
sel.sel = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].selector);
return sel;
}
void vmx_write_segment_selector(struct CPUState *cpu, x68_segment_selector selector, X86Seg seg)
{
wvmcs(cpu->hvf->fd, vmx_segment_fields[seg].selector, selector.sel);
}
void vmx_read_segment_descriptor(struct CPUState *cpu, struct vmx_segment *desc, X86Seg seg)
{
desc->sel = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].selector);
desc->base = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].base);
desc->limit = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].limit);
desc->ar = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].ar_bytes);
}
void vmx_write_segment_descriptor(CPUState *cpu, struct vmx_segment *desc, X86Seg seg)
{
const struct vmx_segment_field *sf = &vmx_segment_fields[seg];
wvmcs(cpu->hvf->fd, sf->base, desc->base);
wvmcs(cpu->hvf->fd, sf->limit, desc->limit);
wvmcs(cpu->hvf->fd, sf->selector, desc->sel);
wvmcs(cpu->hvf->fd, sf->ar_bytes, desc->ar);
}
void x86_segment_descriptor_to_vmx(struct CPUState *cpu, x68_segment_selector selector, struct x86_segment_descriptor *desc, struct vmx_segment *vmx_desc)
{
vmx_desc->sel = selector.sel;
vmx_desc->base = x86_segment_base(desc);
vmx_desc->limit = x86_segment_limit(desc);
vmx_desc->ar = (selector.sel ? 0 : 1) << 16 |
desc->g << 15 |
desc->db << 14 |
desc->l << 13 |
desc->avl << 12 |
desc->p << 7 |
desc->dpl << 5 |
desc->s << 4 |
desc->type;
}
void vmx_segment_to_x86_descriptor(struct CPUState *cpu, struct vmx_segment *vmx_desc, struct x86_segment_descriptor *desc)
{
x86_set_segment_limit(desc, vmx_desc->limit);
x86_set_segment_base(desc, vmx_desc->base);
desc->type = vmx_desc->ar & 15;
desc->s = (vmx_desc->ar >> 4) & 1;
desc->dpl = (vmx_desc->ar >> 5) & 3;
desc->p = (vmx_desc->ar >> 7) & 1;
desc->avl = (vmx_desc->ar >> 12) & 1;
desc->l = (vmx_desc->ar >> 13) & 1;
desc->db = (vmx_desc->ar >> 14) & 1;
desc->g = (vmx_desc->ar >> 15) & 1;
}
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