avr/qmk/ChibiOS - [no description]

	Commit message (Expand)	Author	Age	Files	Lines
*	CMSIS update and cleanup.	Giovanni Di Sirio	2017-10-15	1	-0/+10648

/****************************************************************************** * common/trace.c * * Xen Trace Buffer * * Copyright (C) 2004 by Intel Research Cambridge * * Author: Mark Williamson, mark.a.williamson@intel.com * Date: January 2004 * * The trace buffer code is designed to allow debugging traces of Xen to be * generated on UP / SMP machines. Each trace entry is timestamped so that * it's possible to reconstruct a chronological record of trace events. * * See also include/xen/trace.h and the dom0 op in * include/hypervisor-ifs/dom0_ops.h */ #include <xen/config.h> #include <asm/types.h> #include <asm/io.h> #include <xen/lib.h> #include <xen/sched.h> #include <xen/slab.h> #include <xen/smp.h> #include <xen/trace.h> #include <xen/errno.h> #include <asm/atomic.h> #include <hypervisor-ifs/dom0_ops.h> /* Pointers to the meta-data objects for all system trace buffers */ struct t_buf *t_bufs[NR_CPUS]; /* a flag recording whether initialisation has been done */ int tb_init_done = 0; /** * init_trace_bufs - performs initialisation of the per-cpu trace buffers. * * This function is called at start of day in order to initialise the per-cpu * trace buffers. The trace buffers are then available for debugging use, via * the %TRACE_xD macros exported in <xen/trace.h>. */ void init_trace_bufs(void) { extern int opt_tbuf_size; int i, order; unsigned long nr_pages; char *rawbuf; struct t_buf *buf; struct domain *dom0; if ( opt_tbuf_size == 0 ) { printk("Xen trace buffers: disabled\n"); return; } nr_pages = smp_num_cpus * opt_tbuf_size; order = get_order(nr_pages * PAGE_SIZE); if ( (rawbuf = (char *)alloc_xenheap_pages(order)) == NULL ) { printk("Xen trace buffers: memory allocation failed\n"); return; } /* Share pages so that xentrace can map them. */ dom0 = find_domain_by_id(0); for( i = 0; i < nr_pages; i++) SHARE_PFN_WITH_DOMAIN(virt_to_page(rawbuf+(i*PAGE_SIZE)), dom0); put_domain(dom0); for ( i = 0; i < smp_num_cpus; i++ ) { buf = t_bufs[i] = (struct t_buf *)&rawbuf[i*opt_tbuf_size*PAGE_SIZE]; /* For use in Xen. */ buf->vdata = (struct t_rec *)(buf+1); buf->head_ptr = buf->vdata; /* For use in user space. */ buf->data = (struct t_rec *)__pa(buf->vdata); buf->head = 0; /* For use in both. */ buf->size = (opt_tbuf_size * PAGE_SIZE - sizeof(struct t_buf)) / sizeof(struct t_rec); } printk("Xen trace buffers: initialised\n"); wmb(); /* above must be visible before tb_init_done flag set */ tb_init_done = 1; } /** * get_tb_info - get trace buffer details * @st: a pointer to a dom0_gettbufs_t to be filled out * * Called by the %DOM0_GETTBUFS dom0 op to fetch the physical address of the * trace buffers. */ int get_tb_info(dom0_gettbufs_t *st) { if(tb_init_done) { extern unsigned int opt_tbuf_size; st->phys_addr = __pa(t_bufs[0]); st->size = opt_tbuf_size * PAGE_SIZE; return 0; } else { st->phys_addr = 0; st->size = 0; return -ENODATA; } }