\u2714\ufe0f sector2.asm<\/p>\n\n\n\n
— \ub450\ubc88\uc9f8 \uc139\ud130 \/ Second sector<\/p>\n\n\n\n
[org 0x8000]<\/code><\/pre>\n\n\n\n1)\ucef4\ud30c\uc77c\ub7ec\ub294 \uc774 \uac12\uc744 \uae30\uc900\uc73c\ub85c \ubaa8\ub4e0 \ubb38\uc790\uc5f4 \uc8fc\uc18c(\uc608: msg_next_sector)\uc758 \uc704\uce58\ub97c \uacc4\uc0b0\ud569\ub2c8\ub2e4.
The compiler calculates the locations of all string addresses (e.g., msg_next_sector) based on this value.<\/p>\n\n\n\n
2)PC\uac00 \ucc98\uc74c \ubd80\ud305\ub418\uc5c8\uc744 \ub54c, 16\ube44\ud2b8 \ub9ac\uc5bc \ubaa8\ub4dc\uc5d0\uc11c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \uae30\ubcf8 \uba54\ubaa8\ub9ac \ub9f5(\uc57d 640KB) \uc911 \uc0ac\uc6a9\uc790\uac00 \ub9c8\uc74c\ub300\ub85c \uc4f8 \uc218 \uc788\ub294 \uc548\uc804\ud55c \uad6c\uac04\uc774 \uc874\uc7ac\ud569\ub2c8\ub2e4.
When a PC first boots up, there is a safe region within the base memory map (approximately 640 KB) available in 16-bit real mode that the user can utilize freely.<\/p>\n\n\n\n
3)\uadf8\ub798\uc11c \uc8fc\uc18c\ub97c 0x9000\uc73c\ub85c \ubc14\uafc0 \uc218 \uc788\uc2b5\ub2c8\ub2e4.
So, you can change the address to 0x9000.<\/p>\n\n\n\n
0x0000 ~ 0x04FF: \nBIOS \uc778\ud130\ub7fd\ud2b8 \ubca1\ud130 \ud14c\uc774\ube14, BIOS \ub370\uc774\ud130 \uc601\uc5ed (\uc808\ub300 \uac74\ub4dc\ub9ac\uba74 \uc548 \ub428)\nBIOS Interrupt Vector Table, BIOS Data Area (must absolutely not be touched)\n\n0x7C00 ~ 0x7DFF: \nMBR \ucf54\ub4dc\uac00 \ub85c\ub4dc\ub418\ub294 \uc601\uc5ed (512\ubc14\uc774\ud2b8)\nThe area where the MBR code is loaded (512 bytes)\n\n0x7E00 ~ 0x9FFFF: \n\ube44\uc5b4 \uc788\ub294 \uc77c\ubc18 \uba54\ubaa8\ub9ac \uc601\uc5ed (\uc790\uc720\ub86d\uac8c \uc0ac\uc6a9 \uac00\ub2a5)\nUnused general memory area (available for free use)<\/code><\/pre>\n\n\n\n— 16\ube44\ud2b8 \ub9ac\uc5bc\ubaa8\ub4dc \/ 16bit real mode<\/p>\n\n\n\n
bits 16<\/code><\/pre>\n\n\n\n— mov si, msg_boot \uc5ec\uae30 si\ub808\uc9c0\uc2a4\ud130\uc5d0 msg_next_sector\uc5d0 \uc800\uc7a5\ub41c \uac12\uc758 \uc8fc\uc18c\ub97c \uc800\uc7a5\ud569\ub2c8\ub2e4.
mov si, msg_boot<\/code>: This stores the address of the value held in msg_next_sector<\/code> into the si<\/code> register.<\/p>\n\n\n\nmov si, msg_next_sector<\/code><\/pre>\n\n\n\n— print_string\ub77c\ubca8 \ud568\uc218 \ud638\ucd9c\uc785\ub2c8\ub2e4.
This is a call to the print_string_label function.<\/p>\n\n\n\n
call print_string<\/code><\/pre>\n\n\n\n— \ub300\uae30\ubaa8\ub4dc\uc785\ub2c8\ub2e4.(\uc790\uae30 \uc790\uc2e0\uc758 \uc704\uce58\ub85c \uc810\ud504\ud569\ub2c8\ub2e4.)
It is in standby mode. (It jumps to its own position.)<\/p>\n\n\n\n
jmp $<\/code><\/pre>\n\n\n\n— \uba54\ubaa8\ub9ac\uc5d0 \uc800\uc7a5\ub41c \ubb38\uc790\uc5f4\uc744 \ud55c \uae00\uc790\uc529 \uc77d\uc5b4\uc11c, \ud654\uba74\uc5d0 \uc5f0\uc18d\uc73c\ub85c \ucd9c\ub825\ud558\ub294 \ud568\uc218\uc785\ub2c8\ub2e4.
This function reads a string stored in memory character by character and outputs it to the screen continuously.<\/p>\n\n\n\n
print_string:\n lodsb\n cmp al, 0\n je .done\n mov ah, 0x0e\n int 0x10\n jmp print_string\n.done:\n ret<\/code><\/pre>\n\n\n\n— \ubcc0\uc218\ub97c \uc120\uc5b8\ubd80\ubd84\uc785\ub2c8\ub2e4.
This is the section where variables are declared.<\/p>\n\n\n\n
1)\uac01 \ubcc0\uc218\uc5d0 \ubb38\uc790\ub97c 1\ubc14\uc774\ud2b8\uc529 \uc800\uc7a5\ud569\ub2c8\ub2e4.
Store one byte of character data in each variable.<\/p>\n\n\n\n
2)13\uc740 \uce90\ub9ac\uc9c0 \ub9ac\ud134(\\r)\uc73c\ub85c \ucee4\uc11c\ub97c \ud604\uc7ac \uc904\uc758 \ub9e8 \uc67c\ucabd(\uccab \ubc88\uc9f8 \uce78)\uc73c\ub85c \uc774\ub3d9\uc2dc\ud0b5\ub2c8\ub2e4.
13 is the carriage return (\\r), which moves the cursor to the far left (the first column) of the current line.<\/p>\n\n\n\n
3)10 \ub77c\uc778 \ud53c\ub4dc(\\n)\ub85c \ucee4\uc11c\ub97c \ud604\uc7ac \uc704\uce58\uc5d0\uc11c \uc815\ud655\ud788 \ud55c \uc904 \uc544\ub798\ub85c \ub0b4\ub9bd\ub2c8\ub2e4.
10 Moves the cursor exactly one line down from its current position using a line feed (\\n).<\/p>\n\n\n\n
msg_next_sector db '3. Hello from Sector 2 (0x8000)!', 13, 10, 0<\/code><\/pre>\n\n\n\n— \uacc4\uc0b0\ub41c \ud69f\uc218\ub9cc\ud07c \ubc14\uc774\ud2b8(db) \uacf5\uac04\uc744 \uc804\ubd80 0\uc73c\ub85c \ucc44\uc6b0\ub77c\ub294 \uba85\ub839\uc5b4\uc785\ub2c8\ub2e4.
This command fills the specified number of bytes (db) with zeros.<\/p>\n\n\n\n
1)\ubd80\ud305\ud310\ubcc4\uc744 \uc704\ud55c \uc2dc\uadf8\ub2c8\ucc98\uac00 \ud544\uc694 \uc5c6\uae30 \ub54c\ubb38\uc5d0 512\uc785\ub2c8\ub2e4.
It is 512 because no signature is required to determine the boot status.<\/p>\n\n\n\n
times 512 - ($ - $$) db 0<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\u2714\ufe0f sector2.asm — \ub450\ubc88\uc9f8 \uc139\ud130 \/ Second sector 1)\ucef4\ud30c\uc77c\ub7ec\ub294 \uc774 \uac12\uc744 \uae30\uc900\uc73c\ub85c \ubaa8\ub4e0 \ubb38\uc790\uc5f4 \uc8fc\uc18c(\uc608: msg_next_sector)\uc758 \uc704\uce58\ub97c \uacc4\uc0b0\ud569\ub2c8\ub2e4.The compiler calculates the locations of all string addresses (e.g., msg_next_sector) based on this value. 2)PC\uac00 \ucc98\uc74c \ubd80\ud305\ub418\uc5c8\uc744 \ub54c, 16\ube44\ud2b8 \ub9ac\uc5bc \ubaa8\ub4dc\uc5d0\uc11c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \uae30\ubcf8 \uba54\ubaa8\ub9ac \ub9f5(\uc57d 640KB) \uc911 \uc0ac\uc6a9\uc790\uac00 \ub9c8\uc74c\ub300\ub85c \uc4f8 \uc218 \uc788\ub294 \uc548\uc804\ud55c \uad6c\uac04\uc774 \uc874\uc7ac\ud569\ub2c8\ub2e4.When […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26,1],"tags":[],"class_list":["post-6062","post","type-post","status-publish","format-standard","hentry","category-os","category-uncategorized","missing-thumbnail"],"_links":{"self":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/6062","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/comments?post=6062"}],"version-history":[{"count":2,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/6062\/revisions"}],"predecessor-version":[{"id":6065,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/6062\/revisions\/6065"}],"wp:attachment":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/media?parent=6062"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/categories?post=6062"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/tags?post=6062"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}