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131abc56e1
The vboxvideo driver has been converted to the atomic modesetting API and all FIXME and TODO items have been fixed, so it is time to move it out of staging. Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190304164724.10210-4-hdegoede@redhat.com
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright (C) 2017 Oracle Corporation
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* Authors: Hans de Goede <hdegoede@redhat.com>
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*/
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#include "vbox_drv.h"
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#include "vboxvideo_vbe.h"
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#include "hgsmi_defs.h"
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/* One-at-a-Time Hash from http://www.burtleburtle.net/bob/hash/doobs.html */
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static u32 hgsmi_hash_process(u32 hash, const u8 *data, int size)
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{
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while (size--) {
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hash += *data++;
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hash += (hash << 10);
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hash ^= (hash >> 6);
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}
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return hash;
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}
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static u32 hgsmi_hash_end(u32 hash)
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{
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hash += (hash << 3);
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hash ^= (hash >> 11);
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hash += (hash << 15);
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return hash;
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}
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/* Not really a checksum but that is the naming used in all vbox code */
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static u32 hgsmi_checksum(u32 offset,
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const struct hgsmi_buffer_header *header,
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const struct hgsmi_buffer_tail *tail)
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{
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u32 checksum;
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checksum = hgsmi_hash_process(0, (u8 *)&offset, sizeof(offset));
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checksum = hgsmi_hash_process(checksum, (u8 *)header, sizeof(*header));
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/* 4 -> Do not checksum the checksum itself */
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checksum = hgsmi_hash_process(checksum, (u8 *)tail, 4);
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return hgsmi_hash_end(checksum);
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}
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void *hgsmi_buffer_alloc(struct gen_pool *guest_pool, size_t size,
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u8 channel, u16 channel_info)
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{
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struct hgsmi_buffer_header *h;
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struct hgsmi_buffer_tail *t;
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size_t total_size;
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dma_addr_t offset;
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total_size = size + sizeof(*h) + sizeof(*t);
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h = gen_pool_dma_alloc(guest_pool, total_size, &offset);
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if (!h)
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return NULL;
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t = (struct hgsmi_buffer_tail *)((u8 *)h + sizeof(*h) + size);
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h->flags = HGSMI_BUFFER_HEADER_F_SEQ_SINGLE;
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h->data_size = size;
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h->channel = channel;
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h->channel_info = channel_info;
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memset(&h->u.header_data, 0, sizeof(h->u.header_data));
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t->reserved = 0;
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t->checksum = hgsmi_checksum(offset, h, t);
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return (u8 *)h + sizeof(*h);
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}
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void hgsmi_buffer_free(struct gen_pool *guest_pool, void *buf)
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{
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struct hgsmi_buffer_header *h =
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(struct hgsmi_buffer_header *)((u8 *)buf - sizeof(*h));
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size_t total_size = h->data_size + sizeof(*h) +
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sizeof(struct hgsmi_buffer_tail);
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gen_pool_free(guest_pool, (unsigned long)h, total_size);
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}
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int hgsmi_buffer_submit(struct gen_pool *guest_pool, void *buf)
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{
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phys_addr_t offset;
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offset = gen_pool_virt_to_phys(guest_pool, (unsigned long)buf -
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sizeof(struct hgsmi_buffer_header));
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outl(offset, VGA_PORT_HGSMI_GUEST);
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/* Make the compiler aware that the host has changed memory. */
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mb();
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return 0;
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}
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