[Skiboot] [RFC PATCH 09/12] core/console: Make inmem_read/inmem_write take a memcons parameter

[Oliver O'Halloran]

Allow the console ring-buffer read/write functions to be used for any
memcons structure. This way we can use them for both the msglog and the
cronus in-memory console once they're split apart.

Signed-off-by: Oliver O'Halloran <oohall at gmail.com>
---
 core/console.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/core/console.c b/core/console.c
index 34944de4f310..719ba67063a0 100644
--- a/core/console.c
+++ b/core/console.c
@@ -187,35 +187,35 @@ bool flush_console(void)
 	return ret;
 }
 
-static void inmem_write(char c)
+static void inmem_write(struct memcons *mcon, char c)
 {
 	uint32_t opos;
 
 	if (!c)
 		return;
-	memcons.obuf[memcons.out_pos++] = c;
-	if (memcons.out_pos >= INMEM_CON_OUT_LEN) {
-		memcons.out_pos = 0;
-		memcons.has_wrapped = true;
+	mcon->obuf[mcon->out_pos++] = c;
+	if (mcon->out_pos >= INMEM_CON_OUT_LEN) {
+		mcon->out_pos = 0;
+		mcon->has_wrapped = true;
 	}
 
 	/*
-	 * We must always re-generate memcons.desc->out_pos because
+	 * We must always re-generate mcon->desc->out_pos because
 	 * under some circumstances, the console script will
 	 * use a broken putmemproc that does RMW on the full
 	 * 8 bytes containing out_pos and in_prod, thus corrupting
 	 * out_pos
 	 */
-	opos = memcons.out_pos;
-	if (memcons.has_wrapped)
+	opos = mcon->out_pos;
+	if (mcon->has_wrapped)
 		opos |= MEMCONS_OUT_POS_WRAP;
 	lwsync();
-	memcons.desc->out_pos = cpu_to_be32(opos);
+	mcon->desc->out_pos = cpu_to_be32(opos);
 }
 
 static void write_char(char c)
 {
-	inmem_write(c);
+	inmem_write(&memcons, c);
 
 	/* If head reaches tail, push tail around & drop chars */
 	if (flush_head == memcons.desc->out_pos)
@@ -250,15 +250,15 @@ ssize_t write(int fd __unused, const void *buf, size_t count)
 	return console_write(true, buf, count);
 }
 
-static size_t inmem_read(char *buf, size_t req)
+static size_t inmem_read(struct memcons *mcon, char *buf, size_t req)
 {
 	size_t read = 0;
-	char *ibuf = (char *)be64_to_cpu(memcons.desc->ibuf_phys);
+	char *ibuf = (char *)be64_to_cpu(mcon->desc->ibuf_phys);
 
-	while (req && be32_to_cpu(memcons.desc->in_prod) != be32_to_cpu(memcons.desc->in_cons)) {
-		*(buf++) = ibuf[be32_to_cpu(memcons.desc->in_cons)];
+	while (req && be32_to_cpu(mcon->desc->in_prod) != be32_to_cpu(mcon->desc->in_cons)) {
+		*(buf++) = ibuf[be32_to_cpu(mcon->desc->in_cons)];
 		lwsync();
-		memcons.desc->in_cons = cpu_to_be32((be32_to_cpu(memcons.desc->in_cons) + 1) % INMEM_CON_IN_LEN);
+		mcon->desc->in_cons = cpu_to_be32((be32_to_cpu(mcon->desc->in_cons) + 1) % INMEM_CON_IN_LEN);
 		req--;
 		read++;
 	}
@@ -271,7 +271,7 @@ ssize_t read(int fd __unused, void *buf, size_t req_count)
 	size_t count = 0;
 
 	if (!count)
-		count = inmem_read(buf, req_count);
+		count = inmem_read(&memcons, buf, req_count);
 	if (need_unlock)
 		unlock(&con_lock);
 	return count;
-- 
2.26.2