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2957f5084d
* Update zlibng * Set cmake path more directly in zlibng to hopefully fix an issue with the build on drone * I'm dumb, missing / in path * Mackal helps with a dumb gitignore issue * Adding all the files, not sure what's ignoring them and im tired of looking * Some tweaks to zlibng build to hopefully get it to build properly. works on msvc now
90 lines
3.2 KiB
C
90 lines
3.2 KiB
C
/* dfltcc_deflate.c - IBM Z DEFLATE CONVERSION CALL general support. */
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#include "../../zbuild.h"
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#include "dfltcc_common.h"
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#include "dfltcc_detail.h"
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/*
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Memory management.
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DFLTCC requires parameter blocks and window to be aligned. zlib-ng allows
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users to specify their own allocation functions, so using e.g.
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`posix_memalign' is not an option. Thus, we overallocate and take the
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aligned portion of the buffer.
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*/
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static inline int is_dfltcc_enabled(void) {
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uint64_t facilities[(DFLTCC_FACILITY / 64) + 1];
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Z_REGISTER uint8_t r0 __asm__("r0");
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memset(facilities, 0, sizeof(facilities));
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r0 = sizeof(facilities) / sizeof(facilities[0]) - 1;
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/* STFLE is supported since z9-109 and only in z/Architecture mode. When
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* compiling with -m31, gcc defaults to ESA mode, however, since the kernel
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* is 64-bit, it's always z/Architecture mode at runtime.
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*/
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__asm__ volatile(
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#ifndef __clang__
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".machinemode push\n"
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".machinemode zarch\n"
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#endif
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"stfle %[facilities]\n"
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#ifndef __clang__
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".machinemode pop\n"
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#endif
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: [facilities] "=Q" (facilities), [r0] "+r" (r0) :: "cc");
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return is_bit_set((const char *)facilities, DFLTCC_FACILITY);
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}
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void Z_INTERNAL dfltcc_reset(PREFIX3(streamp) strm, uInt size) {
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struct dfltcc_state *dfltcc_state = (struct dfltcc_state *)((char *)strm->state + ALIGN_UP(size, 8));
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struct dfltcc_qaf_param *param = (struct dfltcc_qaf_param *)&dfltcc_state->param;
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/* Initialize available functions */
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if (is_dfltcc_enabled()) {
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dfltcc(DFLTCC_QAF, param, NULL, NULL, NULL, NULL, NULL);
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memmove(&dfltcc_state->af, param, sizeof(dfltcc_state->af));
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} else
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memset(&dfltcc_state->af, 0, sizeof(dfltcc_state->af));
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/* Initialize parameter block */
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memset(&dfltcc_state->param, 0, sizeof(dfltcc_state->param));
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dfltcc_state->param.nt = 1;
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/* Initialize tuning parameters */
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dfltcc_state->level_mask = DFLTCC_LEVEL_MASK;
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dfltcc_state->block_size = DFLTCC_BLOCK_SIZE;
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dfltcc_state->block_threshold = DFLTCC_FIRST_FHT_BLOCK_SIZE;
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dfltcc_state->dht_threshold = DFLTCC_DHT_MIN_SAMPLE_SIZE;
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dfltcc_state->param.ribm = DFLTCC_RIBM;
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}
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void Z_INTERNAL *dfltcc_alloc_state(PREFIX3(streamp) strm, uInt items, uInt size) {
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return ZALLOC(strm, ALIGN_UP(items * size, 8) + sizeof(struct dfltcc_state), sizeof(unsigned char));
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}
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void Z_INTERNAL dfltcc_copy_state(void *dst, const void *src, uInt size) {
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memcpy(dst, src, ALIGN_UP(size, 8) + sizeof(struct dfltcc_state));
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}
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static const int PAGE_ALIGN = 0x1000;
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void Z_INTERNAL *dfltcc_alloc_window(PREFIX3(streamp) strm, uInt items, uInt size) {
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void *p;
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void *w;
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/* To simplify freeing, we store the pointer to the allocated buffer right
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* before the window.
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*/
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p = ZALLOC(strm, sizeof(void *) + items * size + PAGE_ALIGN, sizeof(unsigned char));
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if (p == NULL)
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return NULL;
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w = ALIGN_UP((char *)p + sizeof(void *), PAGE_ALIGN);
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*(void **)((char *)w - sizeof(void *)) = p;
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return w;
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}
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void Z_INTERNAL dfltcc_free_window(PREFIX3(streamp) strm, void *w) {
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if (w)
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ZFREE(strm, *(void **)((unsigned char *)w - sizeof(void *)));
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}
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