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path: root/drivers/staging/vboxvideo/vbox_hgsmi.c
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Diffstat (limited to 'drivers/staging/vboxvideo/vbox_hgsmi.c')
-rw-r--r--drivers/staging/vboxvideo/vbox_hgsmi.c95
1 files changed, 0 insertions, 95 deletions
diff --git a/drivers/staging/vboxvideo/vbox_hgsmi.c b/drivers/staging/vboxvideo/vbox_hgsmi.c
deleted file mode 100644
index 94b60654a012..000000000000
--- a/drivers/staging/vboxvideo/vbox_hgsmi.c
+++ /dev/null
@@ -1,95 +0,0 @@
-// SPDX-License-Identifier: MIT
-/*
- * Copyright (C) 2017 Oracle Corporation
- * Authors: Hans de Goede <hdegoede@redhat.com>
- */
-
-#include "vbox_drv.h"
-#include "vboxvideo_vbe.h"
-#include "hgsmi_defs.h"
-
-/* One-at-a-Time Hash from http://www.burtleburtle.net/bob/hash/doobs.html */
-static u32 hgsmi_hash_process(u32 hash, const u8 *data, int size)
-{
- while (size--) {
- hash += *data++;
- hash += (hash << 10);
- hash ^= (hash >> 6);
- }
-
- return hash;
-}
-
-static u32 hgsmi_hash_end(u32 hash)
-{
- hash += (hash << 3);
- hash ^= (hash >> 11);
- hash += (hash << 15);
-
- return hash;
-}
-
-/* Not really a checksum but that is the naming used in all vbox code */
-static u32 hgsmi_checksum(u32 offset,
- const struct hgsmi_buffer_header *header,
- const struct hgsmi_buffer_tail *tail)
-{
- u32 checksum;
-
- checksum = hgsmi_hash_process(0, (u8 *)&offset, sizeof(offset));
- checksum = hgsmi_hash_process(checksum, (u8 *)header, sizeof(*header));
- /* 4 -> Do not checksum the checksum itself */
- checksum = hgsmi_hash_process(checksum, (u8 *)tail, 4);
-
- return hgsmi_hash_end(checksum);
-}
-
-void *hgsmi_buffer_alloc(struct gen_pool *guest_pool, size_t size,
- u8 channel, u16 channel_info)
-{
- struct hgsmi_buffer_header *h;
- struct hgsmi_buffer_tail *t;
- size_t total_size;
- dma_addr_t offset;
-
- total_size = size + sizeof(*h) + sizeof(*t);
- h = gen_pool_dma_alloc(guest_pool, total_size, &offset);
- if (!h)
- return NULL;
-
- t = (struct hgsmi_buffer_tail *)((u8 *)h + sizeof(*h) + size);
-
- h->flags = HGSMI_BUFFER_HEADER_F_SEQ_SINGLE;
- h->data_size = size;
- h->channel = channel;
- h->channel_info = channel_info;
- memset(&h->u.header_data, 0, sizeof(h->u.header_data));
-
- t->reserved = 0;
- t->checksum = hgsmi_checksum(offset, h, t);
-
- return (u8 *)h + sizeof(*h);
-}
-
-void hgsmi_buffer_free(struct gen_pool *guest_pool, void *buf)
-{
- struct hgsmi_buffer_header *h =
- (struct hgsmi_buffer_header *)((u8 *)buf - sizeof(*h));
- size_t total_size = h->data_size + sizeof(*h) +
- sizeof(struct hgsmi_buffer_tail);
-
- gen_pool_free(guest_pool, (unsigned long)h, total_size);
-}
-
-int hgsmi_buffer_submit(struct gen_pool *guest_pool, void *buf)
-{
- phys_addr_t offset;
-
- offset = gen_pool_virt_to_phys(guest_pool, (unsigned long)buf -
- sizeof(struct hgsmi_buffer_header));
- outl(offset, VGA_PORT_HGSMI_GUEST);
- /* Make the compiler aware that the host has changed memory. */
- mb();
-
- return 0;
-}