cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

framebuffer.c (3350B)

      1/*
      2 * Framebuffer device helper routines
      3 *
      4 * Copyright (c) 2009 CodeSourcery
      5 * Written by Paul Brook <paul@codesourcery.com>
      6 *
      7 * This code is licensed under the GNU GPLv2.
      8 *
      9 * Contributions after 2012-01-13 are licensed under the terms of the
     10 * GNU GPL, version 2 or (at your option) any later version.
     11 */
     12
     13/* TODO:
     14   - Do something similar for framebuffers with local ram
     15   - Handle rotation here instead of hacking dest_pitch
     16   - Use common pixel conversion routines instead of per-device drawfn
     17   - Remove all DisplayState knowledge from devices.
     18 */
     19
     20#include "qemu/osdep.h"
     21#include "ui/console.h"
     22#include "framebuffer.h"
     23
     24void framebuffer_update_memory_section(
     25    MemoryRegionSection *mem_section,
     26    MemoryRegion *root,
     27    hwaddr base,
     28    unsigned rows,
     29    unsigned src_width)
     30{
     31    hwaddr src_len = (hwaddr)rows * src_width;
     32
     33    if (mem_section->mr) {
     34        memory_region_set_log(mem_section->mr, false, DIRTY_MEMORY_VGA);
     35        memory_region_unref(mem_section->mr);
     36        mem_section->mr = NULL;
     37    }
     38
     39    *mem_section = memory_region_find(root, base, src_len);
     40    if (!mem_section->mr) {
     41        return;
     42    }
     43
     44    if (int128_get64(mem_section->size) < src_len ||
     45            !memory_region_is_ram(mem_section->mr)) {
     46        memory_region_unref(mem_section->mr);
     47        mem_section->mr = NULL;
     48        return;
     49    }
     50
     51    memory_region_set_log(mem_section->mr, true, DIRTY_MEMORY_VGA);
     52}
     53
     54/* Render an image from a shared memory framebuffer.  */
     55void framebuffer_update_display(
     56    DisplaySurface *ds,
     57    MemoryRegionSection *mem_section,
     58    int cols, /* Width in pixels.  */
     59    int rows, /* Height in pixels.  */
     60    int src_width, /* Length of source line, in bytes.  */
     61    int dest_row_pitch, /* Bytes between adjacent horizontal output pixels.  */
     62    int dest_col_pitch, /* Bytes between adjacent vertical output pixels.  */
     63    int invalidate, /* nonzero to redraw the whole image.  */
     64    drawfn fn,
     65    void *opaque,
     66    int *first_row, /* Input and output.  */
     67    int *last_row /* Output only */)
     68{
     69    DirtyBitmapSnapshot *snap;
     70    uint8_t *dest;
     71    uint8_t *src;
     72    int first, last = 0;
     73    int dirty;
     74    int i;
     75    ram_addr_t addr;
     76    MemoryRegion *mem;
     77
     78    i = *first_row;
     79    *first_row = -1;
     80
     81    mem = mem_section->mr;
     82    if (!mem) {
     83        return;
     84    }
     85
     86    addr = mem_section->offset_within_region;
     87    src = memory_region_get_ram_ptr(mem) + addr;
     88
     89    dest = surface_data(ds);
     90    if (dest_col_pitch < 0) {
     91        dest -= dest_col_pitch * (cols - 1);
     92    }
     93    if (dest_row_pitch < 0) {
     94        dest -= dest_row_pitch * (rows - 1);
     95    }
     96    first = -1;
     97
     98    addr += i * src_width;
     99    src += i * src_width;
    100    dest += i * dest_row_pitch;
    101
    102    snap = memory_region_snapshot_and_clear_dirty(mem, addr, src_width * rows,
    103                                                  DIRTY_MEMORY_VGA);
    104    for (; i < rows; i++) {
    105        dirty = memory_region_snapshot_get_dirty(mem, snap, addr, src_width);
    106        if (dirty || invalidate) {
    107            fn(opaque, dest, src, cols, dest_col_pitch);
    108            if (first == -1)
    109                first = i;
    110            last = i;
    111        }
    112        addr += src_width;
    113        src += src_width;
    114        dest += dest_row_pitch;
    115    }
    116    g_free(snap);
    117    if (first < 0) {
    118        return;
    119    }
    120    *first_row = first;
    121    *last_row = last;
    122}