From 60c532a504d9905994b5fd720c29d7d85538c97e Mon Sep 17 00:00:00 2001
From: ablechen <17895010372@163.com>
Date: Mon, 8 Aug 2022 22:33:59 +0800
Subject: [PATCH 1/4] fixed the comment of 'reg_save t6'

---
 code/os/03-contextswitch/entry.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/code/os/03-contextswitch/entry.S b/code/os/03-contextswitch/entry.S
index e952564..5896878 100644
--- a/code/os/03-contextswitch/entry.S
+++ b/code/os/03-contextswitch/entry.S
@@ -90,7 +90,7 @@
 switch_to:
 	csrrw	t6, mscratch, t6	# swap t6 and mscratch
 	beqz	t6, 1f			# Notice: previous task may be NULL
-	reg_save t6			# save context of prev task
+	reg_save t6			# save context of current task
 
 	# Save the actual t6 register, which we swapped into
 	# mscratch
-- 
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From 250487afc128c544555c85da9a942fc179098e68 Mon Sep 17 00:00:00 2001
From: ablechen <17895010372@163.com>
Date: Mon, 8 Aug 2022 22:58:01 +0800
Subject: [PATCH 2/4] fixed the comment of 'reg_save t6'

---
 code/os/03-contextswitch/entry.S | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/code/os/03-contextswitch/entry.S b/code/os/03-contextswitch/entry.S
index 5896878..d4b5818 100644
--- a/code/os/03-contextswitch/entry.S
+++ b/code/os/03-contextswitch/entry.S
@@ -89,7 +89,8 @@
 .align 4
 switch_to:
 	csrrw	t6, mscratch, t6	# swap t6 and mscratch
-	beqz	t6, 1f			# Notice: previous task may be NULL
+	beqz	t6, 1f			# Notice: if this is the first time to run, t6 will be NULL,
+					# because after sched_init, mscratch is NULL
 	reg_save t6			# save context of current task
 
 	# Save the actual t6 register, which we swapped into
-- 
Gitee


From 9e9298dbebab9d996aa883c9678ac0d451d93448 Mon Sep 17 00:00:00 2001
From: ablechen <17895010372@163.com>
Date: Tue, 9 Aug 2022 20:19:28 +0800
Subject: [PATCH 3/4] fixed a word in the comment

---
 code/os/04-multitask/sched.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/code/os/04-multitask/sched.c b/code/os/04-multitask/sched.c
index 85259df..1bb3bfd 100644
--- a/code/os/04-multitask/sched.c
+++ b/code/os/04-multitask/sched.c
@@ -43,7 +43,7 @@ void schedule()
 /*
  * DESCRIPTION
  * 	Create a task.
- * 	- start_routin: task routune entry
+ * 	- start_routin: task routine entry
  * RETURN VALUE
  * 	0: success
  * 	-1: if error occured
-- 
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From c2842a5df6053bcb8afd7456fcd2ffe8814f316c Mon Sep 17 00:00:00 2001
From: ablechen <17895010372@163.com>
Date: Tue, 1 Nov 2022 21:29:14 +0800
Subject: [PATCH 4/4] fix some useless statements

---
 code/os/02-memanagement/page.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/code/os/02-memanagement/page.c b/code/os/02-memanagement/page.c
index b0f1924..fddddd4 100644
--- a/code/os/02-memanagement/page.c
+++ b/code/os/02-memanagement/page.c
@@ -117,8 +117,8 @@ void *page_alloc(int npages)
 			 * meet a free page, continue to check if following
 			 * (npages - 1) pages are also unallocated.
 			 */
-			struct Page *page_j = page_i;
-			for (int j = i; j < (i + npages); j++) {
+			struct Page *page_j = page_i+1;
+			for (int j = i+1; j < (i + npages); j++) {
 				if (!_is_free(page_j)) {
 					found = 0;
 					break;
-- 
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