common/cpr/cpr_dump.c

4  * The contents of this file are subject to the terms of the
23  * Use is subject to license terms.
29  *	2. Allocate bitmaps according to phys_install
31  *	4. Write bitmaps to state file
32  *	5. Write actual physical page data to state file
58 #define	BTOb(bytes)	((bytes) << 3)		/* Bytes to bits, log2(NBBY) */
59 #define	bTOB(bits)	((bits) >> 3)		/* bits to Bytes, log2(NBBY) */
94 static char *cpr_wptr;		/* keep track of where to write to next */
105  * during bcopy (eg, to prevent cpu migration).  If the
111  * need to copy overlaps with our thread structure we will
115 cprbcopy(void *from, void *to, size_t bytes)
123 		caddr_t src = from, dst = to;
128 		bcopy(from, to, bytes);
138 	char *allocerr = "Unable to allocate memory for cpr buffer";
142 	 * set the cpr write buffer size to at least the historic
143 	 * size (128k) or large enough to store the both the early
145 	 * bitmaps, and roundup to the next pagesize.
189  *	1. header magic -- unique to cpr state file
215 	 * Remember how many pages we plan to save to statefile.
217 	 * Untag those pages that will not be saved to statefile.
231 	 * is dumped to disk.  We have already untagged them from regular
253 	 * go retry now to save un-necessary operations.
271  *	1. header magic -- unique to cpr state file
272  *	2. all misc info that needs to be passed to cprboot or resumed kernel
310 	 * and write to disk
341 	 * to get an accurate view of kas, we need to untag sensitive
352 	 * now it's OK to call a driver that makes allocations
358 	 * according to the sensitive descriptors
378 	 * sanity check to verify the right number of pages were dumped
419 	/* point to top of internal buffer */
441 	 * set internal cross checking; we dont want to call
448 	 * 1253112: heap corruption due to memory allocation when dumpping
452 	 * during sddump, which is not supposed to happen after the system
453 	 * is quiesced. Let's call the kernel pages that tend to be affected
455 	 * will allocate some storage space to save the clean sensitive pages
533 	 * If we are about to start walking the range of addresses we
535 	 * heap_lp_arena to find what segments are actually populated
548  * faster scan of kvseg using vmem_walk() to visit
591  * faster scan of segkpm using hat_kpm_walk() to visit only used ranges.
624 #define	KSEG_PTR_ADDR	1	/* address of pointer to struct seg */
628 	pgcnt_t	(*st_fcn)(int, bitfunc_t, struct seg *); /* function to call */
663  * to find out whether a sparsely filled segment needs special
666  *       module shouldn't need to know segment details like if it is
699 	 * Some pages need to be taken care of differently.
701 	 * to be saved.  On sun4u, the physical pages of panicbuf are
716  * Set a bit corresponding to the arg phys page number;
743  * Clear a bit corresponding to the arg phys page number.
776  * Lookup a bit corresponding to the arg phys page number.
799  * stage. This is also used to save pages with cow lock or phys page lock held
851 	 * set length to the original uncompressed data size;
852 	 * always init cpd_flag to zero
872 	 * try compressing the raw data to cpr_pagedata;
874 	 * flag the compression, and point to the compressed data.
888 			 * decompress the data back to a scratch area
890 			 * checksum to verify the compression.
906  * 1. Prepare cpr page descriptor and write it to file
975 	 * calculate count up to buf page boundary, then write it out.
1021 		cpr_wptr = cpr_buf;		/* back to top of buffer */
1034 	 * Calculate remaining blocks in buffer, rounded up to nearest