From 13fe461374c0716404e2ee7726781b9cd12dbaa7 Mon Sep 17 00:00:00 2001
From: Kimplul <kimi.h.kuparinen@gmail.com>
Date: Sat, 25 Sep 2021 12:24:24 +0300
Subject: Added default stack location

---
 arch/riscv/config.h        |  6 ++++--
 arch/riscv/include/pages.h | 46 +++++-----------------------------------------
 arch/riscv/init/head.S     |  2 +-
 arch/riscv/init/init.c     |  9 +++++++--
 4 files changed, 17 insertions(+), 46 deletions(-)

(limited to 'arch')

diff --git a/arch/riscv/config.h b/arch/riscv/config.h
index 3eedb39..8bfe360 100644
--- a/arch/riscv/config.h
+++ b/arch/riscv/config.h
@@ -1,5 +1,7 @@
 #include <apos/sizes.h>
-#define PM_KERN 0x83800000
+#define PM_KERN		0x83800000
+#define PM_STACK_BASE	0x83900000
+#define PM_STACK_TOP	(PM_STACK_BASE + SZ_2M - 2)
 #define VM_KERN ((-1) - SZ_1G)
 
 #define MAX_ORDER 3
@@ -7,4 +9,4 @@
 #define O0_WIDTH 9
 #define O1_WIDTH 9
 #define O2_WIDTH 9
-#define O3_WIDTH 0
+#define O3_WIDTH 9
diff --git a/arch/riscv/include/pages.h b/arch/riscv/include/pages.h
index 9e16c00..1533f7b 100644
--- a/arch/riscv/include/pages.h
+++ b/arch/riscv/include/pages.h
@@ -2,50 +2,14 @@
 #define APOS_RISCV_PAGES_H
 
 #include <apos/types.h>
+#include <apos/pmem.h>
 
-typedef uint8_t pagemask_t;
-typedef uint8_t lockbit_t;
 /* assume riscv64 for now */
 typedef uint64_t pm_t;
 
-struct mm_kpages {
-	pagemask_t page[64];
-};
-
-struct mm_mpages {
-	lockbit_t lockbit[64];
-	pagemask_t empty[64];
-	pagemask_t full[64];
-	struct mm_kpages kilo[512];
-};
-
-/* Sv39 */
-struct mm_gpages {
-	lockbit_t lockbit[64];
-	pagemask_t empty[64];
-	pagemask_t full[64];
-	struct mm_mpages mega[512];
-};
-
-struct mm_tpages {
-	lockbit_t lockbit[64];
-	pagemask_t empty[64];
-	pagemask_t full[64];
-	struct mm_gpages giga[512];
-};
-
-struct mm_ptinfo {
-	short tera_num;
-	struct terapages *tera_top;
-
-	short giga_num;
-	struct gigapages *giga_top;
-
-	short mega_num;
-	struct megapages *mega_top;
-
-	short kilo_num;
-	struct kilopages *kilo_top;
-};
+#define MM_KPAGE MM_O0
+#define MM_MPAGE MM_O1
+#define MM_GPAGE MM_O2
+#define MM_TPAGE MM_O3
 
 #endif /* APOS_RISCV_PAGES_H */
diff --git a/arch/riscv/init/head.S b/arch/riscv/init/head.S
index bbd2945..3589ead 100644
--- a/arch/riscv/init/head.S
+++ b/arch/riscv/init/head.S
@@ -2,6 +2,6 @@
 .global _start
 .type _start, @function
 _start:
-	/* stack pointer is whatever? */	
+	li sp, PM_STACK_TOP
 	/* go to proper init */
 	j init
diff --git a/arch/riscv/init/init.c b/arch/riscv/init/init.c
index 5612d0b..86c2563 100644
--- a/arch/riscv/init/init.c
+++ b/arch/riscv/init/init.c
@@ -112,8 +112,8 @@ static pm_t get_kerneltop()
 	/* interesting, for some reason if I define these to be just char
 	 * pointers I get some wacky values. Not sure why that would be, but
 	 * this works. */
-	extern char __init_end[], __kernel_size[];
-	return (pm_t)__init_end + (pm_t)__kernel_size;
+	extern char __init_end, __kernel_size;
+	return (pm_t)&__init_end + (pm_t)&__kernel_size;
 }
 
 static pm_t get_initrdtop(void *fdt)
@@ -146,11 +146,16 @@ static void setup_pmem(void *fdt)
 	dbg("kernel_top:\t%#lx\n", kernel_top);
 	dbg("fdt_top:\t%#lx\n", fdt_top);
 
+	/* TODO: check that pmap placement doesn't overwrite anything, such as
+	 * stack or go over top address of memory */
 	/* riscv handles two byte boundaries better than one byte, so align
 	 * upwards */
 	populate_pmap(pmem.base, pmem.top - pmem.base, align_up(top + 1, 2));
 
 	/* TODO: mark used pages */
+
+	/* mark init stack */
+	mark_used(PM_STACK_BASE, MM_MPAGE);
 }
 
 void init(void *fdt)
-- 
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