Calculate kernel size in pages dinamically

arch/riscv/common.s

@@ -2,9 +2,6 @@
 # v. 2.0. If a copy of the MPL was not distributed with this file, You can
 # obtain one at https://mozilla.org/MPL/2.0/.
 
-.global write_s, write_c
-.global memcmp, memchr, memmem, memcpy, bzero
-
 .section .text
 
 # a0 - First pointer.
@@ -13,6 +10,7 @@
 #
 # Returns 0 in a0 if memory regions are equal.
 .type memcmp, @function
+.globl memcmp
 memcmp:
 	mv t0, a0
 	li a0, 0
@@ -41,6 +39,7 @@ memcmp:
 # a0 - String pointer.
 # a1 - Length of the string.
 .type write_s, @function
+.globl write_s
 write_s:
 	# Prologue.
 	addi sp, sp, -32
@@ -80,6 +79,7 @@ write_s:
 # Arguments:
 # a0 - Character.
 .type write_c, @function
+.globl write_c
 write_c:
 	li a1, 0
 	li a2, 0
@@ -102,6 +102,7 @@ write_c:
 # Sets a0 to the pointer to the found character or to null if the character
 # doesn't occur in the memory block.
 .type memchr, @function
+.globl memchr
 memchr:
 .Lmemchr_loop:
 	beqz a2, .Lmemchr_nil # Exit if the length is 0.
@@ -132,6 +133,7 @@ memchr:
 # Sets a0 to the pointer to the beginning of the substring in memory or to 0
 # if the substring doesn't occur in the block.
 .type memmem, @function
+.globl memmem
 memmem:
 	# Prologue.
 	addi sp, sp, -24
@@ -193,6 +195,7 @@ memmem:
 #
 # Preserves a0.
 .type memcpy, @function
+.globl memcpy
 memcpy:
 	mv t0, a0
 
@@ -200,30 +203,37 @@ memcpy:
 	beqz a2, .Lmemcpy_end
 
 	lbu t1, (a1)
-	sb t1, (a0)
+	sb t1, (t0)
 
-	addi a0, a0, 1
+	addi t0, t0, 1
 	addi a1, a1, 1
 	addi a2, a2, -1
 
 	j .Lmemcpy_loop
 
 .Lmemcpy_end:
-	mv a0, t0
 	ret
 
-# Zeroes a chank of memory.
+# Sets a memory region to the given byte value.
 #
 # Parameters:
-# a0 - Memory pointer.
-# a1 - Memory size.
-bzero:
+# a0 - Memory chunk to fill.
+# a1 - Constant byte.
+# a2 - Memory size.
+.type memset, @function
+.globl memset
+memset:
 	mv t0, a0
 
-.Lbzero_loop:
-	bgt t0, a1, .Lbzero_end
-	sb zero, (t0)
+.Lmemset_loop:
+	beqz a2, .Lmemset_end
+
+	sb a1, (t0)
+
+	addi a2, a2, -1
 	addi t0, t0, 1
 
-.Lbzero_end:
+	j .Lmemset_loop
+
+.Lmemset_end:
 	ret