diff options
Diffstat (limited to 'drivers/crypto/nx')
| -rw-r--r-- | drivers/crypto/nx/nx-842-pseries.c | 779 |
1 files changed, 153 insertions, 626 deletions
diff --git a/drivers/crypto/nx/nx-842-pseries.c b/drivers/crypto/nx/nx-842-pseries.c index 6db99924652c..85837e96e9a3 100644 --- a/drivers/crypto/nx/nx-842-pseries.c +++ b/drivers/crypto/nx/nx-842-pseries.c @@ -21,7 +21,6 @@ * Seth Jennings <sjenning@linux.vnet.ibm.com> */ -#include <asm/page.h> #include <asm/vio.h> #include "nx-842.h" @@ -32,11 +31,6 @@ MODULE_LICENSE("GPL"); MODULE_AUTHOR("Robert Jennings <rcj@linux.vnet.ibm.com>"); MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors"); -#define SHIFT_4K 12 -#define SHIFT_64K 16 -#define SIZE_4K (1UL << SHIFT_4K) -#define SIZE_64K (1UL << SHIFT_64K) - /* IO buffer must be 128 byte aligned */ #define IO_BUFFER_ALIGN 128 @@ -47,18 +41,52 @@ static struct nx842_constraints nx842_pseries_constraints = { .maximum = PAGE_SIZE, /* dynamic, max_sync_size */ }; -struct nx842_header { - int blocks_nr; /* number of compressed blocks */ - int offset; /* offset of the first block (from beginning of header) */ - int sizes[0]; /* size of compressed blocks */ -}; - -static inline int nx842_header_size(const struct nx842_header *hdr) +static int check_constraints(unsigned long buf, unsigned int *len, bool in) { - return sizeof(struct nx842_header) + - hdr->blocks_nr * sizeof(hdr->sizes[0]); + if (!IS_ALIGNED(buf, nx842_pseries_constraints.alignment)) { + pr_debug("%s buffer 0x%lx not aligned to 0x%x\n", + in ? "input" : "output", buf, + nx842_pseries_constraints.alignment); + return -EINVAL; + } + if (*len % nx842_pseries_constraints.multiple) { + pr_debug("%s buffer len 0x%x not multiple of 0x%x\n", + in ? "input" : "output", *len, + nx842_pseries_constraints.multiple); + if (in) + return -EINVAL; + *len = round_down(*len, nx842_pseries_constraints.multiple); + } + if (*len < nx842_pseries_constraints.minimum) { + pr_debug("%s buffer len 0x%x under minimum 0x%x\n", + in ? "input" : "output", *len, + nx842_pseries_constraints.minimum); + return -EINVAL; + } + if (*len > nx842_pseries_constraints.maximum) { + pr_debug("%s buffer len 0x%x over maximum 0x%x\n", + in ? "input" : "output", *len, + nx842_pseries_constraints.maximum); + if (in) + return -EINVAL; + *len = nx842_pseries_constraints.maximum; + } + return 0; } +/* I assume we need to align the CSB? */ +#define WORKMEM_ALIGN (256) + +struct nx842_workmem { + /* scatterlist */ + char slin[4096]; + char slout[4096]; + /* coprocessor status/parameter block */ + struct nx_csbcpb csbcpb; + + char padding[WORKMEM_ALIGN]; +} __aligned(WORKMEM_ALIGN); + /* Macros for fields within nx_csbcpb */ /* Check the valid bit within the csbcpb valid field */ #define NX842_CSBCBP_VALID_CHK(x) (x & BIT_MASK(7)) @@ -72,8 +100,7 @@ static inline int nx842_header_size(const struct nx842_header *hdr) #define NX842_CSBCPB_CE2(x) (x & BIT_MASK(5)) /* The NX unit accepts data only on 4K page boundaries */ -#define NX842_HW_PAGE_SHIFT SHIFT_4K -#define NX842_HW_PAGE_SIZE (ASM_CONST(1) << NX842_HW_PAGE_SHIFT) +#define NX842_HW_PAGE_SIZE (4096) #define NX842_HW_PAGE_MASK (~(NX842_HW_PAGE_SIZE-1)) enum nx842_status { @@ -194,41 +221,6 @@ static int nx842_build_scatterlist(unsigned long buf, int len, return 0; } -/* - * Working memory for software decompression - */ -struct sw842_fifo { - union { - char f8[256][8]; - char f4[512][4]; - }; - char f2[256][2]; - unsigned char f84_full; - unsigned char f2_full; - unsigned char f8_count; - unsigned char f2_count; - unsigned int f4_count; -}; - -/* - * Working memory for crypto API - */ -struct nx842_workmem { - char bounce[PAGE_SIZE]; /* bounce buffer for decompression input */ - union { - /* hardware working memory */ - struct { - /* scatterlist */ - char slin[SIZE_4K]; - char slout[SIZE_4K]; - /* coprocessor status/parameter block */ - struct nx_csbcpb csbcpb; - }; - /* software working memory */ - struct sw842_fifo swfifo; /* software decompression fifo */ - }; -}; - static int nx842_validate_result(struct device *dev, struct cop_status_block *csb) { @@ -291,8 +283,8 @@ static int nx842_validate_result(struct device *dev, * compressed data. If there is an error then @outlen will be 0 and an * error will be specified by the return code from this function. * - * @in: Pointer to input buffer, must be page aligned - * @inlen: Length of input buffer, must be PAGE_SIZE + * @in: Pointer to input buffer + * @inlen: Length of input buffer * @out: Pointer to output buffer * @outlen: Length of output buffer * @wrkmem: ptr to buffer for working memory, size determined by @@ -302,7 +294,6 @@ static int nx842_validate_result(struct device *dev, * 0 Success, output of length @outlen stored in the buffer at @out * -ENOMEM Unable to allocate internal buffers * -ENOSPC Output buffer is to small - * -EMSGSIZE XXX Difficult to describe this limitation * -EIO Internal error * -ENODEV Hardware unavailable */ @@ -310,29 +301,26 @@ static int nx842_pseries_compress(const unsigned char *in, unsigned int inlen, unsigned char *out, unsigned int *outlen, void *wmem) { - struct nx842_header *hdr; struct nx842_devdata *local_devdata; struct device *dev = NULL; struct nx842_workmem *workmem; struct nx842_scatterlist slin, slout; struct nx_csbcpb *csbcpb; - int ret = 0, max_sync_size, i, bytesleft, size, hdrsize; - unsigned long inbuf, outbuf, padding; + int ret = 0, max_sync_size; + unsigned long inbuf, outbuf; struct vio_pfo_op op = { .done = NULL, .handle = 0, .timeout = 0, }; - unsigned long start_time = get_tb(); + unsigned long start = get_tb(); - /* - * Make sure input buffer is 64k page aligned. This is assumed since - * this driver is designed for page compression only (for now). This - * is very nice since we can now use direct DDE(s) for the input and - * the alignment is guaranteed. - */ inbuf = (unsigned long)in; - if (!IS_ALIGNED(inbuf, PAGE_SIZE) || inlen != PAGE_SIZE) + if (check_constraints(inbuf, &inlen, true)) + return -EINVAL; + + outbuf = (unsigned long)out; + if (check_constraints(outbuf, outlen, false)) return -EINVAL; rcu_read_lock(); @@ -344,16 +332,8 @@ static int nx842_pseries_compress(const unsigned char *in, unsigned int inlen, max_sync_size = local_devdata->max_sync_size; dev = local_devdata->dev; - /* Create the header */ - hdr = (struct nx842_header *)out; - hdr->blocks_nr = PAGE_SIZE / max_sync_size; - hdrsize = nx842_header_size(hdr); - outbuf = (unsigned long)out + hdrsize; - bytesleft = *outlen - hdrsize; - /* Init scatterlist */ - workmem = (struct nx842_workmem *)ALIGN((unsigned long)wmem, - NX842_HW_PAGE_SIZE); + workmem = PTR_ALIGN(wmem, WORKMEM_ALIGN); slin.entries = (struct nx842_slentry *)workmem->slin; slout.entries = (struct nx842_slentry *)workmem->slout; @@ -364,105 +344,48 @@ static int nx842_pseries_compress(const unsigned char *in, unsigned int inlen, op.csbcpb = nx842_get_pa(csbcpb); op.out = nx842_get_pa(slout.entries); - for (i = 0; i < hdr->blocks_nr; i++) { - /* - * Aligning the output blocks to 128 bytes does waste space, - * but it prevents the need for bounce buffers and memory - * copies. It also simplifies the code a lot. In the worst - * case (64k page, 4k max_sync_size), you lose up to - * (128*16)/64k = ~3% the compression factor. For 64k - * max_sync_size, the loss would be at most 128/64k = ~0.2%. - */ - padding = ALIGN(outbuf, IO_BUFFER_ALIGN) - outbuf; - outbuf += padding; - bytesleft -= padding; - if (i == 0) - /* save offset into first block in header */ - hdr->offset = padding + hdrsize; - - if (bytesleft <= 0) { - ret = -ENOSPC; - goto unlock; - } - - /* - * NOTE: If the default max_sync_size is changed from 4k - * to 64k, remove the "likely" case below, since a - * scatterlist will always be needed. - */ - if (likely(max_sync_size == NX842_HW_PAGE_SIZE)) { - /* Create direct DDE */ - op.in = nx842_get_pa((void *)inbuf); - op.inlen = max_sync_size; - - } else { - /* Create indirect DDE (scatterlist) */ - nx842_build_scatterlist(inbuf, max_sync_size, &slin); - op.in = nx842_get_pa(slin.entries); - op.inlen = -nx842_get_scatterlist_size(&slin); - } + if ((inbuf & NX842_HW_PAGE_MASK) == + ((inbuf + inlen - 1) & NX842_HW_PAGE_MASK)) { + /* Create direct DDE */ + op.in = nx842_get_pa((void *)inbuf); + op.inlen = inlen; + } else { + /* Create indirect DDE (scatterlist) */ + nx842_build_scatterlist(inbuf, inlen, &slin); + op.in = nx842_get_pa(slin.entries); + op.inlen = -nx842_get_scatterlist_size(&slin); + } - /* - * If max_sync_size != NX842_HW_PAGE_SIZE, an indirect - * DDE is required for the outbuf. - * If max_sync_size == NX842_HW_PAGE_SIZE, outbuf must - * also be page aligned (1 in 128/4k=32 chance) in order - * to use a direct DDE. - * This is unlikely, just use an indirect DDE always. - */ - nx842_build_scatterlist(outbuf, - min(bytesleft, max_sync_size), &slout); - /* op.out set before loop */ + if ((outbuf & NX842_HW_PAGE_MASK) == + ((outbuf + *outlen - 1) & NX842_HW_PAGE_MASK)) { + /* Create direct DDE */ + op.out = nx842_get_pa((void *)outbuf); + op.outlen = *outlen; + } else { + /* Create indirect DDE (scatterlist) */ + nx842_build_scatterlist(outbuf, *outlen, &slout); + op.out = nx842_get_pa(slout.entries); op.outlen = -nx842_get_scatterlist_size(&slout); + } - /* Send request to pHyp */ - ret = vio_h_cop_sync(local_devdata->vdev, &op); - - /* Check for pHyp error */ - if (ret) { - dev_dbg(dev, "%s: vio_h_cop_sync error (ret=%d, hret=%ld)\n", - __func__, ret, op.hcall_err); - ret = -EIO; - goto unlock; - } - - /* Check for hardware error */ - ret = nx842_validate_result(dev, &csbcpb->csb); - if (ret && ret != -ENOSPC) - goto unlock; - - /* Handle incompressible data */ - if (unlikely(ret == -ENOSPC)) { - if (bytesleft < max_sync_size) { - /* - * Not enough space left in the output buffer - * to store uncompressed block - */ - goto unlock; - } else { - /* Store incompressible block */ - memcpy((void *)outbuf, (void *)inbuf, - max_sync_size); - hdr->sizes[i] = -max_sync_size; - outbuf += max_sync_size; - bytesleft -= max_sync_size; - /* Reset ret, incompressible data handled */ - ret = 0; - } - } else { - /* Normal case, compression was successful */ - size = csbcpb->csb.processed_byte_count; - dev_dbg(dev, "%s: processed_bytes=%d\n", - __func__, size); - hdr->sizes[i] = size; - outbuf += size; - bytesleft -= size; - } + /* Send request to pHyp */ + ret = vio_h_cop_sync(local_devdata->vdev, &op); - inbuf += max_sync_size; + /* Check for pHyp error */ + if (ret) { + dev_dbg(dev, "%s: vio_h_cop_sync error (ret=%d, hret=%ld)\n", + __func__, ret, op.hcall_err); + ret = -EIO; + goto unlock; } - *outlen = (unsigned int)(outbuf - (unsigned long)out); + /* Check for hardware error */ + ret = nx842_validate_result(dev, &csbcpb->csb); + if (ret) + goto unlock; + + *outlen = csbcpb->csb.processed_byte_count; + dev_dbg(dev, "%s: processed_bytes=%d\n", __func__, *outlen); unlock: if (ret) @@ -470,15 +393,12 @@ unlock: else { nx842_inc_comp_complete(local_devdata); ibm_nx842_incr_hist(local_devdata->counters->comp_times, - (get_tb() - start_time) / tb_ticks_per_usec); + (get_tb() - start) / tb_ticks_per_usec); } rcu_read_unlock(); return ret; } -static int sw842_decompress(const unsigned char *, int, unsigned char *, int *, - const void *); - /** * nx842_pseries_decompress - Decompress data using the 842 algorithm * @@ -490,11 +410,10 @@ static int sw842_decompress(const unsigned char *, int, unsigned char *, int *, * If there is an error then @outlen will be 0 and an error will be * specified by the return code from this function. * - * @in: Pointer to input buffer, will use bounce buffer if not 128 byte - * aligned + * @in: Pointer to input buffer * @inlen: Length of input buffer - * @out: Pointer to output buffer, must be page aligned - * @outlen: Length of output buffer, must be PAGE_SIZE + * @out: Pointer to output buffer + * @outlen: Length of output buffer * @wrkmem: ptr to buffer for working memory, size determined by * NX842_MEM_COMPRESS * @@ -510,43 +429,39 @@ static int nx842_pseries_decompress(const unsigned char *in, unsigned int inlen, unsigned char *out, unsigned int *outlen, void *wmem) { - struct nx842_header *hdr; struct nx842_devdata *local_devdata; struct device *dev = NULL; struct nx842_workmem *workmem; struct nx842_scatterlist slin, slout; struct nx_csbcpb *csbcpb; - int ret = 0, i, size, max_sync_size; + int ret = 0, max_sync_size; unsigned long inbuf, outbuf; struct vio_pfo_op op = { .done = NULL, .handle = 0, .timeout = 0, }; - unsigned long start_time = get_tb(); + unsigned long start = get_tb(); /* Ensure page alignment and size */ + inbuf = (unsigned long)in; + if (check_constraints(inbuf, &inlen, true)) + return -EINVAL; + outbuf = (unsigned long)out; - if (!IS_ALIGNED(outbuf, PAGE_SIZE) || *outlen != PAGE_SIZE) + if (check_constraints(outbuf, outlen, false)) return -EINVAL; rcu_read_lock(); local_devdata = rcu_dereference(devdata); - if (local_devdata) - dev = local_devdata->dev; - - /* Get header */ - hdr = (struct nx842_header *)in; - - workmem = (struct nx842_workmem *)ALIGN((unsigned long)wmem, - NX842_HW_PAGE_SIZE); - - inbuf = (unsigned long)in + hdr->offset; - if (likely(!IS_ALIGNED(inbuf, IO_BUFFER_ALIGN))) { - /* Copy block(s) into bounce buffer for alignment */ - memcpy(workmem->bounce, in + hdr->offset, inlen - hdr->offset); - inbuf = (unsigned long)workmem->bounce; + if (!local_devdata || !local_devdata->dev) { + rcu_read_unlock(); + return -ENODEV; } + max_sync_size = local_devdata->max_sync_size; + dev = local_devdata->dev; + + workmem = PTR_ALIGN(wmem, WORKMEM_ALIGN); /* Init scatterlist */ slin.entries = (struct nx842_slentry *)workmem->slin; @@ -558,119 +473,55 @@ static int nx842_pseries_decompress(const unsigned char *in, unsigned int inlen, memset(csbcpb, 0, sizeof(*csbcpb)); op.csbcpb = nx842_get_pa(csbcpb); - /* - * max_sync_size may have changed since compression, - * so we can't read it from the device info. We need - * to derive it from hdr->blocks_nr. - */ - max_sync_size = PAGE_SIZE / hdr->blocks_nr; - - for (i = 0; i < hdr->blocks_nr; i++) { - /* Skip padding */ - inbuf = ALIGN(inbuf, IO_BUFFER_ALIGN); - - if (hdr->sizes[i] < 0) { - /* Negative sizes indicate uncompressed data blocks */ - size = abs(hdr->sizes[i]); - memcpy((void *)outbuf, (void *)inbuf, size); - outbuf += size; - inbuf += size; - continue; - } - - if (!dev) - goto sw; - - /* - * The better the compression, the more likely the "likely" - * case becomes. - */ - if (likely((inbuf & NX842_HW_PAGE_MASK) == - ((inbuf + hdr->sizes[i] - 1) & NX842_HW_PAGE_MASK))) { - /* Create direct DDE */ - op.in = nx842_get_pa((void *)inbuf); - op.inlen = hdr->sizes[i]; - } else { - /* Create indirect DDE (scatterlist) */ - nx842_build_scatterlist(inbuf, hdr->sizes[i] , &slin); - op.in = nx842_get_pa(slin.entries); - op.inlen = -nx842_get_scatterlist_size(&slin); - } - - /* - * NOTE: If the default max_sync_size is changed from 4k - * to 64k, remove the "likely" case below, since a - * scatterlist will always be needed. - */ - if (likely(max_sync_size == NX842_HW_PAGE_SIZE)) { - /* Create direct DDE */ - op.out = nx842_get_pa((void *)outbuf); - op.outlen = max_sync_size; - } else { - /* Create indirect DDE (scatterlist) */ - nx842_build_scatterlist(outbuf, max_sync_size, &slout); - op.out = nx842_get_pa(slout.entries); - op.outlen = -nx842_get_scatterlist_size(&slout); - } - - /* Send request to pHyp */ - ret = vio_h_cop_sync(local_devdata->vdev, &op); - - /* Check for pHyp error */ - if (ret) { - dev_dbg(dev, "%s: vio_h_cop_sync error (ret=%d, hret=%ld)\n", - __func__, ret, op.hcall_err); - dev = NULL; - goto sw; - } + if ((inbuf & NX842_HW_PAGE_MASK) == + ((inbuf + inlen - 1) & NX842_HW_PAGE_MASK)) { + /* Create direct DDE */ + op.in = nx842_get_pa((void *)inbuf); + op.inlen = inlen; + } else { + /* Create indirect DDE (scatterlist) */ + nx842_build_scatterlist(inbuf, inlen, &slin); + op.in = nx842_get_pa(slin.entries); + op.inlen = -nx842_get_scatterlist_size(&slin); + } - /* Check for hardware error */ - ret = nx842_validate_result(dev, &csbcpb->csb); - if (ret) { - dev = NULL; - goto sw; - } + if ((outbuf & NX842_HW_PAGE_MASK) == + ((outbuf + *outlen - 1) & NX842_HW_PAGE_MASK)) { + /* Create direct DDE */ + op.out = nx842_get_pa((void *)outbuf); + op.outlen = *outlen; + } else { + /* Create indirect DDE (scatterlist) */ + nx842_build_scatterlist(outbuf, *outlen, &slout); + op.out = nx842_get_pa(slout.entries); + op.outlen = -nx842_get_scatterlist_size(&slout); + } - /* HW decompression success */ - inbuf += hdr->sizes[i]; - outbuf += csbcpb->csb.processed_byte_count; - continue; - -sw: - /* software decompression */ - size = max_sync_size; - ret = sw842_decompress( - (unsigned char *)inbuf, hdr->sizes[i], - (unsigned char *)outbuf, &size, wmem); - if (ret) - pr_debug("%s: sw842_decompress failed with %d\n", - __func__, ret); - - if (ret) { - if (ret != -ENOSPC && ret != -EINVAL && - ret != -EMSGSIZE) - ret = -EIO; - goto unlock; - } + /* Send request to pHyp */ + ret = vio_h_cop_sync(local_devdata->vdev, &op); - /* SW decompression success */ - inbuf += hdr->sizes[i]; - outbuf += size; + /* Check for pHyp error */ + if (ret) { + dev_dbg(dev, "%s: vio_h_cop_sync error (ret=%d, hret=%ld)\n", + __func__, ret, op.hcall_err); + goto unlock; } - *outlen = (unsigned int)(outbuf - (unsigned long)out); + /* Check for hardware error */ + ret = nx842_validate_result(dev, &csbcpb->csb); + if (ret) + goto unlock; + + *outlen = csbcpb->csb.processed_byte_count; unlock: if (ret) /* decompress fail */ nx842_inc_decomp_failed(local_devdata); else { - if (!dev) - /* software decompress */ - nx842_inc_swdecomp(local_devdata); nx842_inc_decomp_complete(local_devdata); ibm_nx842_incr_hist(local_devdata->counters->decomp_times, - (get_tb() - start_time) / tb_ticks_per_usec); + (get_tb() - start) / tb_ticks_per_usec); } rcu_read_unlock(); @@ -829,9 +680,9 @@ static int nx842_OF_upd_maxsyncop(struct nx842_devdata *devdata, maxsynccop->decomp_data_limit); devdata->max_sync_size = min_t(unsigned int, devdata->max_sync_size, - SIZE_64K); + 65536); - if (devdata->max_sync_size < SIZE_4K) { + if (devdata->max_sync_size < 4096) { dev_err(devdata->dev, "%s: hardware max data size (%u) is " "less than the driver minimum, unable to use " "the hardware device\n", @@ -1220,17 +1071,17 @@ static int __exit nx842_remove(struct vio_dev *viodev) return 0; } -static struct vio_device_id nx842_driver_ids[] = { +static struct vio_device_id nx842_vio_driver_ids[] = { {NX842_PSERIES_COMPAT_NAME "-v1", NX842_PSERIES_COMPAT_NAME}, {"", ""}, }; -static struct vio_driver nx842_driver = { +static struct vio_driver nx842_vio_driver = { .name = MODULE_NAME, .probe = nx842_probe, .remove = __exit_p(nx842_remove), .get_desired_dma = nx842_get_desired_dma, - .id_table = nx842_driver_ids, + .id_table = nx842_vio_driver_ids, }; static int __init nx842_init(void) @@ -1249,7 +1100,7 @@ static int __init nx842_init(void) new_devdata->status = UNAVAILABLE; RCU_INIT_POINTER(devdata, new_devdata); - return vio_register_driver(&nx842_driver); + return vio_register_driver(&nx842_vio_driver); } module_init(nx842_init); @@ -1266,336 +1117,12 @@ static void __exit nx842_exit(void) RCU_INIT_POINTER(devdata, NULL); spin_unlock_irqrestore(&devdata_mutex, flags); synchronize_rcu(); - if (old_devdata) + if (old_devdata && old_devdata->dev) dev_set_drvdata(old_devdata->dev, NULL); kfree(old_devdata); nx842_unregister_driver(&nx842_pseries_driver); - vio_unregister_driver(&nx842_driver); + vio_unregister_driver(&nx842_vio_driver); } module_exit(nx842_exit); -/********************************* - * 842 software decompressor -*********************************/ -typedef int (*sw842_template_op)(const char **, int *, unsigned char **, - struct sw842_fifo *); - -static int sw842_data8(const char **, int *, unsigned char **, - struct sw842_fifo *); -static int sw842_data4(const char **, int *, unsigned char **, - struct sw842_fifo *); -static int sw842_data2(const char **, int *, unsigned char **, - struct sw842_fifo *); -static int sw842_ptr8(const char **, int *, unsigned char **, - struct sw842_fifo *); -static int sw842_ptr4(const char **, int *, unsigned char **, - struct sw842_fifo *); -static int sw842_ptr2(const char **, int *, unsigned char **, - struct sw842_fifo *); - -/* special templates */ -#define SW842_TMPL_REPEAT 0x1B -#define SW842_TMPL_ZEROS 0x1C -#define SW842_TMPL_EOF 0x1E - -static sw842_template_op sw842_tmpl_ops[26][4] = { - { sw842_data8, NULL}, /* 0 (00000) */ - { sw842_data4, sw842_data2, sw842_ptr2, NULL}, - { sw842_data4, sw842_ptr2, sw842_data2, NULL}, - { sw842_data4, sw842_ptr2, sw842_ptr2, NULL}, - { sw842_data4, sw842_ptr4, NULL}, - { sw842_data2, sw842_ptr2, sw842_data4, NULL}, - { sw842_data2, sw842_ptr2, sw842_data2, sw842_ptr2}, - { sw842_data2, sw842_ptr2, sw842_ptr2, sw842_data2}, - { sw842_data2, sw842_ptr2, sw842_ptr2, sw842_ptr2,}, - { sw842_data2, sw842_ptr2, sw842_ptr4, NULL}, - { sw842_ptr2, sw842_data2, sw842_data4, NULL}, /* 10 (01010) */ - { sw842_ptr2, sw842_data4, sw842_ptr2, NULL}, - { sw842_ptr2, sw842_data2, sw842_ptr2, sw842_data2}, - { sw842_ptr2, sw842_data2, sw842_ptr2, sw842_ptr2}, - { sw842_ptr2, sw842_data2, sw842_ptr4, NULL}, - { sw842_ptr2, sw842_ptr2, sw842_data4, NULL}, - { sw842_ptr2, sw842_ptr2, sw842_data2, sw842_ptr2}, - { sw842_ptr2, sw842_ptr2, sw842_ptr2, sw842_data2}, - { sw842_ptr2, sw842_ptr2, sw842_ptr2, sw842_ptr2}, - { sw842_ptr2, sw842_ptr2, sw842_ptr4, NULL}, - { sw842_ptr4, sw842_data4, NULL}, /* 20 (10100) */ - { sw842_ptr4, sw842_data2, sw842_ptr2, NULL}, - { sw842_ptr4, sw842_ptr2, sw842_data2, NULL}, - { sw842_ptr4, sw842_ptr2, sw842_ptr2, NULL}, - { sw842_ptr4, sw842_ptr4, NULL}, - { sw842_ptr8, NULL} -}; - -/* Software decompress helpers */ - -static uint8_t sw842_get_byte(const char *buf, int bit) -{ - uint8_t tmpl; - uint16_t tmp; - tmp = htons(*(uint16_t *)(buf)); - tmp = (uint16_t)(tmp << bit); - tmp = ntohs(tmp); - memcpy(&tmpl, &tmp, 1); - return tmpl; -} - -static uint8_t sw842_get_template(const char **buf, int *bit) -{ - uint8_t byte; - byte = sw842_get_byte(*buf, *bit); - byte = byte >> 3; - byte &= 0x1F; - *buf += (*bit + 5) / 8; - *bit = (*bit + 5) % 8; - return byte; -} - -/* repeat_count happens to be 5-bit too (like the template) */ -static uint8_t sw842_get_repeat_count(const char **buf, int *bit) -{ - uint8_t byte; - byte = sw842_get_byte(*buf, *bit); - byte = byte >> 2; - byte &= 0x3F; - *buf += (*bit + 6) / 8; - *bit = (*bit + 6) % 8; - return byte; -} - -static uint8_t sw842_get_ptr2(const char **buf, int *bit) -{ - uint8_t ptr; - ptr = sw842_get_byte(*buf, *bit); - (*buf)++; - return ptr; -} - -static uint16_t sw842_get_ptr4(const char **buf, int *bit, - struct sw842_fifo *fifo) -{ - uint16_t ptr; - ptr = htons(*(uint16_t *)(*buf)); - ptr = (uint16_t)(ptr << *bit); - ptr = ptr >> 7; - ptr &= 0x01FF; - *buf += (*bit + 9) / 8; - *bit = (*bit + 9) % 8; - return ptr; -} - -static uint8_t sw842_get_ptr8(const char **buf, int *bit, - struct sw842_fifo *fifo) -{ - return sw842_get_ptr2(buf, bit); -} - -/* Software decompress template ops */ - -static int sw842_data8(const char **inbuf, int *inbit, - unsigned char **outbuf, struct sw842_fifo *fifo) -{ - int ret; - - ret = sw842_data4(inbuf, inbit, outbuf, fifo); - if (ret) - return ret; - ret = sw842_data4(inbuf, inbit, outbuf, fifo); - return ret; -} - -static int sw842_data4(const char **inbuf, int *inbit, - unsigned char **outbuf, struct sw842_fifo *fifo) -{ - int ret; - - ret = sw842_data2(inbuf, inbit, outbuf, fifo); - if (ret) - return ret; - ret = sw842_data2(inbuf, inbit, outbuf, fifo); - return ret; -} - -static int sw842_data2(const char **inbuf, int *inbit, - unsigned char **outbuf, struct sw842_fifo *fifo) -{ - **outbuf = sw842_get_byte(*inbuf, *inbit); - (*inbuf)++; - (*outbuf)++; - **outbuf = sw842_get_byte(*inbuf, *inbit); - (*inbuf)++; - (*outbuf)++; - return 0; -} - -static int sw842_ptr8(const char **inbuf, int *inbit, - unsigned char **outbuf, struct sw842_fifo *fifo) -{ - uint8_t ptr; - ptr = sw842_get_ptr8(inbuf, inbit, fifo); - if (!fifo->f84_full && (ptr >= fifo->f8_count)) - return 1; - memcpy(*outbuf, fifo->f8[ptr], 8); - *outbuf += 8; - return 0; -} - -static int sw842_ptr4(const char **inbuf, int *inbit, - unsigned char **outbuf, struct sw842_fifo *fifo) -{ - uint16_t ptr; - ptr = sw842_get_ptr4(inbuf, inbit, fifo); - if (!fifo->f84_full && (ptr >= fifo->f4_count)) - return 1; - memcpy(*outbuf, fifo->f4[ptr], 4); - *outbuf += 4; - return 0; -} - -static int sw842_ptr2(const char **inbuf, int *inbit, - unsigned char **outbuf, struct sw842_fifo *fifo) -{ - uint8_t ptr; - ptr = sw842_get_ptr2(inbuf, inbit); - if (!fifo->f2_full && (ptr >= fifo->f2_count)) - return 1; - memcpy(*outbuf, fifo->f2[ptr], 2); - *outbuf += 2; - return 0; -} - -static void sw842_copy_to_fifo(const char *buf, struct sw842_fifo *fifo) -{ - unsigned char initial_f2count = fifo->f2_count; - - memcpy(fifo->f8[fifo->f8_count], buf, 8); - fifo->f4_count += 2; - fifo->f8_count += 1; - - if (!fifo->f84_full && fifo->f4_count >= 512) { - fifo->f84_full = 1; - fifo->f4_count /= 512; - } - - memcpy(fifo->f2[fifo->f2_count++], buf, 2); - memcpy(fifo->f2[fifo->f2_count++], buf + 2, 2); - memcpy(fifo->f2[fifo->f2_count++], buf + 4, 2); - memcpy(fifo->f2[fifo->f2_count++], buf + 6, 2); - if (fifo->f2_count < initial_f2count) - fifo->f2_full = 1; -} - -static int sw842_decompress(const unsigned char *src, int srclen, - unsigned char *dst, int *destlen, - const void *wrkmem) -{ - uint8_t tmpl; - const char *inbuf; - int inbit = 0; - unsigned char *outbuf, *outbuf_end, *origbuf, *prevbuf; - const char *inbuf_end; - sw842_template_op op; - int opindex; - int i, repeat_count; - struct sw842_fifo *fifo; - int ret = 0; - - fifo = &((struct nx842_workmem *)(wrkmem))->swfifo; - memset(fifo, 0, sizeof(*fifo)); - - origbuf = NULL; - inbuf = src; - inbuf_end = src + srclen; - outbuf = dst; - outbuf_end = dst + *destlen; - - while ((tmpl = sw842_get_template(&inbuf, &inbit)) != SW842_TMPL_EOF) { - if (inbuf >= inbuf_end) { - ret = -EINVAL; - goto out; - } - - opindex = 0; - prevbuf = origbuf; - origbuf = outbuf; - switch (tmpl) { - case SW842_TMPL_REPEAT: - if (prevbuf == NULL) { - ret = -EINVAL; - goto out; - } - - repeat_count = sw842_get_repeat_count(&inbuf, - &inbit) + 1; - - /* Did the repeat count advance past the end of input */ - if (inbuf > inbuf_end) { - ret = -EINVAL; - goto out; - } - - for (i = 0; i < repeat_count; i++) { - /* Would this overflow the output buffer */ - if ((outbuf + 8) > outbuf_end) { - ret = -ENOSPC; - goto out; - } - - memcpy(outbuf, prevbuf, 8); - sw842_copy_to_fifo(outbuf, fifo); - outbuf += 8; - } - break; - - case SW842_TMPL_ZEROS: - /* Would this overflow the output buffer */ - if ((outbuf + 8) > outbuf_end) { - ret = -ENOSPC; - goto out; - } - - memset(outbuf, 0, 8); - sw842_copy_to_fifo(outbuf, fifo); - outbuf += 8; - break; - - default: - if (tmpl > 25) { - ret = -EINVAL; - goto out; - } - - /* Does this go past the end of the input buffer */ - if ((inbuf + 2) > inbuf_end) { - ret = -EINVAL; - goto out; - } - - /* Would this overflow the output buffer */ - if ((outbuf + 8) > outbuf_end) { - ret = -ENOSPC; - goto out; - } - - while (opindex < 4 && - (op = sw842_tmpl_ops[tmpl][opindex++]) - != NULL) { - ret = (*op)(&inbuf, &inbit, &outbuf, fifo); - if (ret) { - ret = -EINVAL; - goto out; - } - sw842_copy_to_fifo(origbuf, fifo); - } - } - } - -out: - if (!ret) - *destlen = (unsigned int)(outbuf - dst); - else - *destlen = 0; - - return ret; -} |