From da6cb6c86d3ea720fbeb325e1779a00d23b39473 Mon Sep 17 00:00:00 2001
From: xamidev <qelal@batareika.com>
Date: Sun, 14 Jul 2024 16:58:35 +0200
Subject: [PATCH] Add: IDT implementation without ISRs

---
 idt.c               |  42 ++++++++++++++++++++++++++++++++++++++++++
 idt.h               |   8 ++++++++
 iso/boot/kernel.elf | Bin 14564 -> 14760 bytes
 kernel.elf          | Bin 14564 -> 14760 bytes
 kmain.c             |   2 ++
 loader.s            |   7 +++++++
 makefile            |   2 +-
 os.iso              | Bin 491520 -> 491520 bytes
 system.c            |   8 ++++++++
 system.h            |   8 ++++++++
 10 files changed, 76 insertions(+), 1 deletion(-)
 create mode 100644 idt.c
 create mode 100644 idt.h
 create mode 100644 system.c
 create mode 100644 system.h

diff --git a/idt.c b/idt.c
new file mode 100644
index 0000000..02f13fe
--- /dev/null
+++ b/idt.c
@@ -0,0 +1,42 @@
+#include "idt.h"
+#include "system.h"
+
+struct idt_entry
+{
+	unsigned short base_lo;
+	unsigned short sel;
+	unsigned char always0;
+	unsigned char flags;
+	unsigned short base_hi;
+} __attribute__((packed));
+
+struct idt_ptr
+{
+	unsigned short limit;
+	unsigned int base;
+} __attribute__((packed));
+
+struct idt_entry idt[256];
+struct idt_ptr idtp;
+
+extern void idt_load();
+
+void idt_set_gate(unsigned char num, unsigned long base, unsigned short sel, unsigned char flags)
+{
+	idt[num].base_lo = (base & 0xFFFF);
+	idt[num].base_hi = (base >> 16) & 0xFFFF;
+
+	idt[num].sel = sel;
+	idt[num].always0 = 0;
+	idt[num].flags = flags;
+}
+
+void idt_install()
+{
+	idtp.limit = (sizeof (struct idt_entry)*256) - 1;
+	idtp.base = (unsigned int)&idt;
+
+	memset(&idt, 0, sizeof(struct idt_entry)*256);
+
+	idt_load();
+}
diff --git a/idt.h b/idt.h
new file mode 100644
index 0000000..2d28f8f
--- /dev/null
+++ b/idt.h
@@ -0,0 +1,8 @@
+#ifndef IDT_H
+#define IDT_H
+
+void idt_set_gate(unsigned char num, unsigned long base, unsigned short sel, unsigned char flags);
+
+void idt_install();
+
+#endif
diff --git a/iso/boot/kernel.elf b/iso/boot/kernel.elf
index 4fafbb55e0a28451e849db49d5488045d35bf9e3..37b93083e6094b2aa4cec9a8fbcee2f813abce40 100755
GIT binary patch
delta 2729
zcma);e^69a6vyv-?6Qk4zPBqNu)wZpil&GLLI{N78kLlzFf}R>siY*P12{TbJM^g7
zS(d~*=}b+jnWZ!7XpU$NmAWdU=D1E)<{u5y_+!--cLiZ}$k+GozLl5bAHA9T<8#ir
z=bn4+z3;s%Yj)RfN{SOil1&KNo{I`kHn9>-`{Yp*WPuP?v`i`z!m-xM`T&&0Q6y9}
z?PX?uPR4=SwZdjG#*Pt9?x2Mb?-~QD*J4qX#}Fd<^tDkgDR^6!=Xtr|5S$R1jCV;1
zJxq3cm|B(@lKmN$dADNnE?ZwZX7953H==P#g|Kkgd~%~-ZtRmAeJ-gK5-N%5iJ`Hx
zH4%Ty-wepIOWM;ze-zDOrEy4^ZF+ddC7tP^e$lMkJ%WYrrzYdrH!kQx4ur$D{+eT6
zz0h$K@y=WR8`kYT6xOi?2+J=r$<86`|5!T1@=eal!PD*v$5qLv@s7tV+PCQzV^(wk
z`O)UkUyND$!{|1-<y5LMwa270c}*%Ibel2B=n*<dB^&MSM^d%<sq~!DLa&>I=wpnv
zbkKBN=Rs1N+==w&$ls#}kT~rOdMYkk_dU8zZjN&C&v89;X8dig=irot37l?`o+)-7
ztQwWcajmp1aTIrlex10K3P}ZAG@Y9?4YfU~m($Yv<jJUaBo}cS+MT=@b)h-C@DAIy
zN?De%mA7U{K7&j8G$eaLk&O?@c7<d)ifm*^w)YO*XSQO#^X4Qjirz5qM!h+u+RhX5
zC{+t!>OBI9cF;tKvr_LY6P*=tEtSC<M_FG>g<t5X2s+CQHI7zK0Zyi~!f@=S=(xbd
zOg0NL))x+!^)W6|_*Ao}7~Qb0qs-sZ>X`{<^V&mugo!oY0!-ZGZpO?tT~a{?E`!b`
zv1uGq5eO#B2{KrVqsXN5yx3HBsJ%t%HAucVZ$D12HlHoQW@xeboHo6~Hh62K(>Cau
z$2lqn5u>j~l<GuI8vd?G8n46Rw0jdBO!3=GugdZ|l<!c^qx7Pjy(Y_}uK&L>9k%u-
z*gr|ed<I~v@}D3tPzLW(IXO$4(#kXZvV7~Iz{O`2i=^g=NZKy79c}Aw^R{_z_T#0Z
zCvJgDEiM)5y|gj;-8ck#<bli_q5puN6|0>sMMV+rq}!m;;C(`hQP$yz;9iCvE9!ET
z{eC*%lFpj~^mS_jZMEq6rvr40C5<l(&<-d%0`xNIcz`}Yb1^`Zt!e!ByENaL&M)l6
zpftX|m%a!3_8$GxI&r%1pP@-oFu@fBwP-+=r=kBSxK$?+R`_kF!EV+KP=0heUl^q0
z&^#ZcFQQozq^m}!@!Nv5ZFIUl<Gw8KR=eQ83i+@?b`dW2L*Jm*WBvTf(DDhh3Brav
zz+OLYvwFxT1@D=1*u3<(P07hIERTe(rx->XU{s(sTE}8J(Eg2qa#>aO0WHfodpMGS
z+N>L5GkC5_Zv}5u@l)Uq6;A~Js^Tf&^U*{8*rz35#m^EljYuj%5e)9BxCH#Fic7(J
zsB!8d`)c$ekA?)~^$|eJ_<gke{=IAkcmndr;f_)V<WJCh_{#h%VL?Ftf^{O1!hS#S
z5)N+o(U4Ab*g;m9CvJLfs>SXBYph{0M|9*GxQ!DDRz^(7Xb;-P7?JcT`~dCNVInD3
zScd~=hMqkl?1zJ&87`8&ie3N@;7(NHL@<8|;BxHHL9}2y8H*0PbI}-J#5Efa#x;Ay
zlfVtJB4NjbImiRI7(~L3ALA4_{s|LA0-g=M2!Dx+zf!OP%&sEy|1$Wfk_QuSk0MJU
zIL?dM$gsmY@Rbpf0UTKeCe{c?lMUc5WGG_a4DQB?*?nOFwKG<Y{|tN|_Ma>I9pFJM
zfZYv~9Rv13(1!qgioqdp=c5RDauzJAQtSb*z!qdG_J4zaMuylOVFBC#4=CeV*muEO
z;D3^$e*pF>0osiiK#)Q`BK%M>Fo3(GMDmxyMsP7w$UYD(h4J7&5Wr$ZKN{>&O_%}J
zt5Ti`zO2&cf!S%n8+2SKV)l(G!3rZOwSk*4zz8!IU>Tj9z22~5X+!1`Qop{wVObsB
znSDTnU^PKiwPIC$L-op)bU{unv#P3J)=>3Ub;B~+nUf>bEvo~E>{h;0y_EWMtWhwc
z!t{HT%T442nw)FVVzy2TEy^9ENAD<p_%w8C)=0WBH<k%bKrn;0=URq^{uiz6Uy=Th
syEb+XJ7&sbrG<GVF`IDE@asY>)RAY_cH)h(knYJFqfNjc=|{}xzk!ta?EnA(

delta 2150
zcma);ZERCj7{|}OecjmB+iflD%GOd)kU-s_8w>{wSQQfyf-F&CQIwDYA(70@sD!dq
zk-2nkJVp|Y1cJt?DT+e`0%TfV6cd4jw}6@ZFkF>(bfwM?2G{?&?H&EV2k&-Xe*g2F
z=Q-y&=eF%??BCpBE6kIahcWhhB`Q1~=46`A8RN4eX2y8Yb#AhYZs&pbn@ycP&Ye=0
zFORX7P}0FzcykV_7qS@hM~oXZ0e><g%ge+1aS%>QToVI+Ym{s8>`cwAXuT;dyh~v0
zj5pyz^fTVr7Bm6>JXo}PBXUzrZc4~ak$``RGH1P(Q9vs3C{U|aoi@BOB+CK+mx???
zm9-7GP6T@!?w{ozk4C9ivQAPg?r4;WZC+zr{pc^Dy4D-d`6GqlU@qU;KQ!JvS-4Eq
zW_#^XgBoFjso^4Kg}YLU=?Cwy=}-^$xV+&K*E>>rhw9KD(T1nPpYApK#9XEyMy7Og
z>4Le;cnsZ^khYYv@;miYxW1A0<Ugvvi?rz$plhdr{6hU{j@cv>3>YpUQ7xeox>ayl
zKZ<PYYUtNOkKqKmEg?PWEenJwJ!y#w(Qc3RF~RUM*3uH{>RvnEE!aAdPyb10TiwAn
zZ!EAxXk8jJ9s00f+aP^iv{tvS1Ak<)RSP<L#x@hR&vskTQe*K9)O(BP3mWPxUX6O5
z-7{~HA7#BP%Q)VfPxvD_0sqH}_H<gCqG+EhT18qbP_*D6?YBFHK{{u*2_pSv??SzE
z!kR1`eky4+S`zauz9GwvC_$97D1#`c|CHtYf&W*^Vf)rY>>s9apApz*__xZ>rYG;o
zaB`Yj94no;VK?ua1k2PKiLE;<vG%L&J?(w%;r8=?591{=(mltdx#5^BYp^A@Fwgj|
zxF}aw>(_{PPla-{S|&lRLD`1H;EF1b6ZJ}z?jd^7=@Kn*+UhJ7-ErEDrY24&oG#aq
zxGYcS)~e5jQ`{Y!0BIEE6t}ic<2V7KufRNl{+PKKR_vXSsxiLrHZ7Xy66+HPWu+|>
zjbd|xwnO=5n7*1g&6>FPV0qkUKjyreM2KR&R%EOxN!c!!=p7+9nq?!j0?oz|YIc>1
zUyRU4pt3u36m<9wU2_#5_|B3?LfK2cxQ-`)KLWF&wi+I=9sE?rxD)(F20sEmkipZy
zzh&^_;IsM%{`e<aMFv+fHj{155az=mmcfg`D>8Tq_%kw>uUgZHp7?E$uMp3WyiIA<
zYDnIW?)_ye`cuk~`~mN%D}nu9;8om@)T3oVbohNy`5;Bh9ljrdT4zcXn1NjZw+a%&
z!dX5N_6ORgEQux3d=u@iY)QFKd^`!ZW1K${nBR+8<0K^-ALsvZt;Fhaf}9QDWjKIt
zv|t~zpu=yr9uv*X$cn%_awPUTm`}J4J^}~of+m9{*cYYkr-F09{9^O@Zg5X}oB5)K
z)q;<U5{@C|Zz;GxSGD&E?0E>xsS0|w3j7l?piWo|?!%6{(hfFr9&;eDx4{Y6f0`a|
z0pCJE{wnYd>;NAdTad_hgC#X%J{atSupTLOrzd<5?t}yW>Tw6h!QqU6A+QDk`32zP
z=fKxB66;O#Mer5)Tb<@U@cHxt_%;W?#&pKKJY`V`*D?(L1@qJ7pC>%PJ+zClVl^ZD
zZF~pz_>x8uSPlg}Z&F3Yeo9oVrwx@J+F$9Q3zZ4_dA3E!qu$vLBg~JL;;K=3SpgNz
z$>l=Nm{5}vPC}SPb#olqNem}J36ZwWY0h=4*A@}ABvfHFIB$GWu@YKZW!F{Xy|dA#
Os!6&!{G51?2l)>~hGbg+

diff --git a/kernel.elf b/kernel.elf
index 4fafbb55e0a28451e849db49d5488045d35bf9e3..37b93083e6094b2aa4cec9a8fbcee2f813abce40 100755
GIT binary patch
delta 2729
zcma);e^69a6vyv-?6Qk4zPBqNu)wZpil&GLLI{N78kLlzFf}R>siY*P12{TbJM^g7
zS(d~*=}b+jnWZ!7XpU$NmAWdU=D1E)<{u5y_+!--cLiZ}$k+GozLl5bAHA9T<8#ir
z=bn4+z3;s%Yj)RfN{SOil1&KNo{I`kHn9>-`{Yp*WPuP?v`i`z!m-xM`T&&0Q6y9}
z?PX?uPR4=SwZdjG#*Pt9?x2Mb?-~QD*J4qX#}Fd<^tDkgDR^6!=Xtr|5S$R1jCV;1
zJxq3cm|B(@lKmN$dADNnE?ZwZX7953H==P#g|Kkgd~%~-ZtRmAeJ-gK5-N%5iJ`Hx
zH4%Ty-wepIOWM;ze-zDOrEy4^ZF+ddC7tP^e$lMkJ%WYrrzYdrH!kQx4ur$D{+eT6
zz0h$K@y=WR8`kYT6xOi?2+J=r$<86`|5!T1@=eal!PD*v$5qLv@s7tV+PCQzV^(wk
z`O)UkUyND$!{|1-<y5LMwa270c}*%Ibel2B=n*<dB^&MSM^d%<sq~!DLa&>I=wpnv
zbkKBN=Rs1N+==w&$ls#}kT~rOdMYkk_dU8zZjN&C&v89;X8dig=irot37l?`o+)-7
ztQwWcajmp1aTIrlex10K3P}ZAG@Y9?4YfU~m($Yv<jJUaBo}cS+MT=@b)h-C@DAIy
zN?De%mA7U{K7&j8G$eaLk&O?@c7<d)ifm*^w)YO*XSQO#^X4Qjirz5qM!h+u+RhX5
zC{+t!>OBI9cF;tKvr_LY6P*=tEtSC<M_FG>g<t5X2s+CQHI7zK0Zyi~!f@=S=(xbd
zOg0NL))x+!^)W6|_*Ao}7~Qb0qs-sZ>X`{<^V&mugo!oY0!-ZGZpO?tT~a{?E`!b`
zv1uGq5eO#B2{KrVqsXN5yx3HBsJ%t%HAucVZ$D12HlHoQW@xeboHo6~Hh62K(>Cau
z$2lqn5u>j~l<GuI8vd?G8n46Rw0jdBO!3=GugdZ|l<!c^qx7Pjy(Y_}uK&L>9k%u-
z*gr|ed<I~v@}D3tPzLW(IXO$4(#kXZvV7~Iz{O`2i=^g=NZKy79c}Aw^R{_z_T#0Z
zCvJgDEiM)5y|gj;-8ck#<bli_q5puN6|0>sMMV+rq}!m;;C(`hQP$yz;9iCvE9!ET
z{eC*%lFpj~^mS_jZMEq6rvr40C5<l(&<-d%0`xNIcz`}Yb1^`Zt!e!ByENaL&M)l6
zpftX|m%a!3_8$GxI&r%1pP@-oFu@fBwP-+=r=kBSxK$?+R`_kF!EV+KP=0heUl^q0
z&^#ZcFQQozq^m}!@!Nv5ZFIUl<Gw8KR=eQ83i+@?b`dW2L*Jm*WBvTf(DDhh3Brav
zz+OLYvwFxT1@D=1*u3<(P07hIERTe(rx->XU{s(sTE}8J(Eg2qa#>aO0WHfodpMGS
z+N>L5GkC5_Zv}5u@l)Uq6;A~Js^Tf&^U*{8*rz35#m^EljYuj%5e)9BxCH#Fic7(J
zsB!8d`)c$ekA?)~^$|eJ_<gke{=IAkcmndr;f_)V<WJCh_{#h%VL?Ftf^{O1!hS#S
z5)N+o(U4Ab*g;m9CvJLfs>SXBYph{0M|9*GxQ!DDRz^(7Xb;-P7?JcT`~dCNVInD3
zScd~=hMqkl?1zJ&87`8&ie3N@;7(NHL@<8|;BxHHL9}2y8H*0PbI}-J#5Efa#x;Ay
zlfVtJB4NjbImiRI7(~L3ALA4_{s|LA0-g=M2!Dx+zf!OP%&sEy|1$Wfk_QuSk0MJU
zIL?dM$gsmY@Rbpf0UTKeCe{c?lMUc5WGG_a4DQB?*?nOFwKG<Y{|tN|_Ma>I9pFJM
zfZYv~9Rv13(1!qgioqdp=c5RDauzJAQtSb*z!qdG_J4zaMuylOVFBC#4=CeV*muEO
z;D3^$e*pF>0osiiK#)Q`BK%M>Fo3(GMDmxyMsP7w$UYD(h4J7&5Wr$ZKN{>&O_%}J
zt5Ti`zO2&cf!S%n8+2SKV)l(G!3rZOwSk*4zz8!IU>Tj9z22~5X+!1`Qop{wVObsB
znSDTnU^PKiwPIC$L-op)bU{unv#P3J)=>3Ub;B~+nUf>bEvo~E>{h;0y_EWMtWhwc
z!t{HT%T442nw)FVVzy2TEy^9ENAD<p_%w8C)=0WBH<k%bKrn;0=URq^{uiz6Uy=Th
syEb+XJ7&sbrG<GVF`IDE@asY>)RAY_cH)h(knYJFqfNjc=|{}xzk!ta?EnA(

delta 2150
zcma);ZERCj7{|}OecjmB+iflD%GOd)kU-s_8w>{wSQQfyf-F&CQIwDYA(70@sD!dq
zk-2nkJVp|Y1cJt?DT+e`0%TfV6cd4jw}6@ZFkF>(bfwM?2G{?&?H&EV2k&-Xe*g2F
z=Q-y&=eF%??BCpBE6kIahcWhhB`Q1~=46`A8RN4eX2y8Yb#AhYZs&pbn@ycP&Ye=0
zFORX7P}0FzcykV_7qS@hM~oXZ0e><g%ge+1aS%>QToVI+Ym{s8>`cwAXuT;dyh~v0
zj5pyz^fTVr7Bm6>JXo}PBXUzrZc4~ak$``RGH1P(Q9vs3C{U|aoi@BOB+CK+mx???
zm9-7GP6T@!?w{ozk4C9ivQAPg?r4;WZC+zr{pc^Dy4D-d`6GqlU@qU;KQ!JvS-4Eq
zW_#^XgBoFjso^4Kg}YLU=?Cwy=}-^$xV+&K*E>>rhw9KD(T1nPpYApK#9XEyMy7Og
z>4Le;cnsZ^khYYv@;miYxW1A0<Ugvvi?rz$plhdr{6hU{j@cv>3>YpUQ7xeox>ayl
zKZ<PYYUtNOkKqKmEg?PWEenJwJ!y#w(Qc3RF~RUM*3uH{>RvnEE!aAdPyb10TiwAn
zZ!EAxXk8jJ9s00f+aP^iv{tvS1Ak<)RSP<L#x@hR&vskTQe*K9)O(BP3mWPxUX6O5
z-7{~HA7#BP%Q)VfPxvD_0sqH}_H<gCqG+EhT18qbP_*D6?YBFHK{{u*2_pSv??SzE
z!kR1`eky4+S`zauz9GwvC_$97D1#`c|CHtYf&W*^Vf)rY>>s9apApz*__xZ>rYG;o
zaB`Yj94no;VK?ua1k2PKiLE;<vG%L&J?(w%;r8=?591{=(mltdx#5^BYp^A@Fwgj|
zxF}aw>(_{PPla-{S|&lRLD`1H;EF1b6ZJ}z?jd^7=@Kn*+UhJ7-ErEDrY24&oG#aq
zxGYcS)~e5jQ`{Y!0BIEE6t}ic<2V7KufRNl{+PKKR_vXSsxiLrHZ7Xy66+HPWu+|>
zjbd|xwnO=5n7*1g&6>FPV0qkUKjyreM2KR&R%EOxN!c!!=p7+9nq?!j0?oz|YIc>1
zUyRU4pt3u36m<9wU2_#5_|B3?LfK2cxQ-`)KLWF&wi+I=9sE?rxD)(F20sEmkipZy
zzh&^_;IsM%{`e<aMFv+fHj{155az=mmcfg`D>8Tq_%kw>uUgZHp7?E$uMp3WyiIA<
zYDnIW?)_ye`cuk~`~mN%D}nu9;8om@)T3oVbohNy`5;Bh9ljrdT4zcXn1NjZw+a%&
z!dX5N_6ORgEQux3d=u@iY)QFKd^`!ZW1K${nBR+8<0K^-ALsvZt;Fhaf}9QDWjKIt
zv|t~zpu=yr9uv*X$cn%_awPUTm`}J4J^}~of+m9{*cYYkr-F09{9^O@Zg5X}oB5)K
z)q;<U5{@C|Zz;GxSGD&E?0E>xsS0|w3j7l?piWo|?!%6{(hfFr9&;eDx4{Y6f0`a|
z0pCJE{wnYd>;NAdTad_hgC#X%J{atSupTLOrzd<5?t}yW>Tw6h!QqU6A+QDk`32zP
z=fKxB66;O#Mer5)Tb<@U@cHxt_%;W?#&pKKJY`V`*D?(L1@qJ7pC>%PJ+zClVl^ZD
zZF~pz_>x8uSPlg}Z&F3Yeo9oVrwx@J+F$9Q3zZ4_dA3E!qu$vLBg~JL;;K=3SpgNz
z$>l=Nm{5}vPC}SPb#olqNem}J36ZwWY0h=4*A@}ABvfHFIB$GWu@YKZW!F{Xy|dA#
Os!6&!{G51?2l)>~hGbg+

diff --git a/kmain.c b/kmain.c
index b15b916..a9712ba 100644
--- a/kmain.c
+++ b/kmain.c
@@ -1,11 +1,13 @@
 #include "stdio.h"
 #include "serial.h"
 #include "gdt.h"
+#include "idt.h"
 
 int kmain(int retvalue)
 {
   
   gdt_install();
+  idt_install();
 
   // serial testing
 
diff --git a/loader.s b/loader.s
index bdf1dd1..25aa675 100644
--- a/loader.s
+++ b/loader.s
@@ -38,6 +38,13 @@ gdt_flush:
 flush2:
 	ret
 
+global idt_load
+extern idtp
+
+idt_load:
+	lidt [idtp]
+	ret
+
 section .bss
 align 4 
 kernel_stack:
diff --git a/makefile b/makefile
index 2f40e62..f663857 100644
--- a/makefile
+++ b/makefile
@@ -1,4 +1,4 @@
-OBJECTS = loader.o kmain.o stdio.o io.o string.o serial.o gdt.o 
+OBJECTS = loader.o kmain.o stdio.o io.o string.o serial.o gdt.o idt.o system.o 
 CC = gcc
 CFLAGS = -m32 -nostdlib -nostdinc -fno-builtin -fno-stack-protector -nostartfiles -nodefaultlibs -Wall -Wextra -c
 LDFLAGS = -T link.ld -melf_i386
diff --git a/os.iso b/os.iso
index 33455f4aead94dfba949c0068f2dfcf3ee780010..b19cf325f0773de7434a4114fc757d0b2d2540fc 100644
GIT binary patch
delta 3000
zcma)8e^6A{6~6E6PjF!$s4E7Q4W<#(NR;v;B2bKOO52b+5vH9eAtp-I3bg|`II&&H
zGYkwa)jIX6sS(5|%+w6(1h9hvvoT_9>N>Tp%^w}6W8y|v+>Iz3hx+>6-M8?X$sfHl
z_nq^7=iGD8J@?-C-p-x#cJ7?lldGiU=Hz8B$<4K9EzZhboVNsel-T#8l4{ZPGh3DR
z8J67qoV@((C1++G@LQylr`tV`8|0-6_w70VN;0H%hb2)bIwbSy;a8=^uB8lZX;;*`
zujbOEbG*YC8*@rZH=p)xlgMG**KqZ<q^Kp{5icBs-zjOP`OWLS*QMD#Gwd?UM#%O&
z5tu=DG9zEqOtTiMcE&_E30`JQ64EJj0Q9v67U@P_+DxhRd`92qX4+=oe}LlL7}n?w
zr!nULl?{)dCE!sO$CwhZZZ>$7@EuiM<(H;`_(&EUc@)Q};O@lhxy%Un&nV~T$l#)D
zEFCFabOm=nc$7kTw73FleNe3*Q|kjBr34ID4p4eZWbjI3Ea1l1LaORfx<~oB1C$!I
zCQVthlOKKJQ9c>vL0BzaiDCsoo_vs=c=f6!62so-dQf%VZ?*RhA?H;a|Aqqi-;dhF
zBJ3Nl38r((`+q!Jqx_!Miiu0!@|Mq)fYHAI)0lq2_aCIi<`9Zx%He;8Zta8K=vC)(
z<00A`mo6+-a~b1D4$|x-pS_n=hzR}%D6T1gF8}l(rSY4G$ZkF_7!#j3L^mxy)VI-_
z!f(Aze>ab#h^A%y<3CWg<t+3@uf(Op^nGcRFF#Coq|v@--l2t(WsOzXI{PY*P^Kj9
z=56gXOS;RCx6^uV@1O$7%wOoBEC_c8-IGkb_9!ia=r~G6l97)brL_=+os?a8S8Qm7
zs;b!J+sl-I&7&NOa6i<z1rhGu2$!RA(<9u;yZpUQa$@2uoitlA@Gm>53*vXjXq}rF
zn=ImLxcmFTm?n}LYpt-hmddT=Gny;HRV}4s&E-LRZ+W=2)K=B9+gE_Y+gffre@kw;
zDrmty2TthrzS1#)i!}W4E?+U!sI9j&*u2}f99Ycjj_e*LHu?)Naiez^X0E!Z6lCDO
zSUifDrbQ_Ng3CsRdTz!+73?ZMwp$!|f02F-N??Zn0nWB5Uo638Yjy=%UDg)Y#O>*=
zt_ja7sik}ZIR=_#rCOGhX}^|P{Y`jW^6udi$0+D7`CL^S&`+aZLBEH7`3qH@b@Tu0
zx$t#=i~qNAB4!A_y7&%twKn)&U69MX@i>)b1XcC+BfB&+qgZBD{W5F2-Zs=W(&lgT
z-Fkp`kCl1t(%j+_ncqK7^Yce=7OW@*Tb^iri=Im`tyByKCSCB_j7Ge5STTA7P71DV
zq&e{{L+=UlmrhVRC5QMcUF6`qPmq<q8{+#<&^#&(@m^u<4e`$e{xHNJ3VAKWAM1i_
z|BB~#!T$0+F?b%;-s8U!_>cGb(Jp!_H}IdS3Flz48%S`?xT<DBpG>so0#b~=AC1`D
z>Tyoph*22kPYU^iF#nN|uZMX}H|97J=54_4jIUL-OCN`hMFKg&T|=B6*z5Fm6oj@!
z>cNCh7(VPFw*Q+xTc>>H;H^{!pC5nIXT^p2qOeRXsu)ghz^Op*)F5&>C7rNwsh=v{
z<0i2OqDjnwXR2iirvksAvpa!z=<s)ddv*9J;J@ndGr(8OQ}M({DPM>2;mcx*jwph|
zeH~r_{8Jq+0q*8WXK9UlE7VvsvXHtx1|S7~6OwvPiY1_h)Za!G?HN*k5AD%UUb+z_
zLh3t0iKPnv9>D83%+Y3K15m`_)-W+I|MV=SxqTpv&L}T23;P1NO_G`Ts3)VQqmcD+
zG8@zILr5MkvtkWfaPU%L7fpu$G~n+|li5klZU-L6J*mK<5b+$qW!R%Lkic&C1Qc-*
z%@~k`ySD%scW)9u4P2KXGjUQxfM<c5Z88%lP~bTT`~fD2CA<=L8SzrIcqPC#U~xS~
z{1<_Tv_d44+rZX?_>g35Wi((l@QuXS0EsmKGiMB&*&DzYQK6XsF5nTYSX>#A&|ZOc
z<KG7U8vchhdk63Y79g%ivKs^512KjK0-D47zyp&R61xm6>q_hc-h?g4)cpSqJctU3
zYa$Z(5_nu2FVg-Bct7Glt=S&}`?Un!Nf^LTLMt+C(j08SBL<oMOT$UP#VDcpZio`j
z1pWsSSgY9|2lnYE%mB9PN}dV)na=(!usAJvt3DaYSbTa`V1==gx`20KKoZ<Uf~9=X
z0ByHzT3?s>I;-7YTeqQ_cMi}g8O&CON9CrP+PZaHw(!;GXtVIEtldyo`SW#k8~DIE
z%CT2(s0I=7-15tH>v`}TISp{*_7CVjmj)?Cvh&9VDb0jg2hw=aAkDWz9m4OTkuT||
z>3qi^B?#&xP|NsU_{K;6I-TN=lmBUuwk13-&Yaeqyl{wC#O=Yc!!Hj@<1Is!Y8t>R
i<YnGHMDxj!*Y}qpsxdbWQ`4}aY1r5_Y&t${?*A|A_*Fpw

delta 2433
zcma);dr(wW9LLZ7?Gxm2RahS=Y-nkYZVN7Iq(;h?&E#WDW-7JR90zr5bPReqF1SS)
zvjow2e58SB0u3f&iVh%z544%o8DFCf`3L5f3j%HizHZ-h_pa<8{?UbVf9LZ(zu)hi
z^SkHnZca{oPEP!RN$#Qc<Yc>JvfZ3)Pj=WRCpnTdp=6Fb&ZPBg*Sbq%O!m~|<W#$(
zcF0z*Nm_TX)bork+@dcjYJPVRta*beD#VmY#)GX(q^R~O4A+$Qz-Y+_XZoFEQiCxy
zQljzT`D}?|Qc6C)uxwyViaMe>fNG>z<EE>JuS&xX#6-!=ft0^b5{Vi5R;J?<@@Ytz
zZy;l$8TgufiX)r#$XEH49bGJ2w``>_R}^EpExiehdDlhY_I4O!Zl8IT&g1U&Dat&r
zaR7u9ve3xmwsZ)sCp=WMsajh=^Kyx?(@uXP7IE6ywE@QCo(7N2PM?z1rDXY)ET6|c
zOO08nXWX-uMmkhV*9Ws^F6&klkGoQpCj@1E=AFjsw#>(8Map9xylpF4MyW3Mb!udR
z(_FCl;hC0<%{Sk4`(nJ+kz#NE@FCl1v~-zI-9~Zg$4tRVRz+uCM4Y!GphO>W-itom
zgniD-yd?CZfL;_#>GtWp<B`#@mhad`cH=#i%aF=1pl_~6Ket66&%?G;v2lzTS<Oqg
z({siLD4*eF(U0S|wo{Dpln}zXw1aM$E}>?*EhG7z9dz0F5S2Hi@n63qhp7?$+!iA@
z?xdHc4*u#+>X15)ICjzVl4%LnmD^HrWcl}GlZF+e!0r>)f{a52&Mwa^Y4hx^=)>O*
z&gtYomeO*=iX!~+=rWor8TcDzlnmo4qq~xxuis4*V9IvWbV<i=?50I9)5^&)ty4VX
z#fqZfx!-=t?ThfZx2xLgnl?t&_NrQnrVUoL>Q27DoUBqOKUYq}B;tRSQw7X7duVAG
zPDY@b{NY~ea?QM{DC^Ox(axfEqMiCvQ3l=me=P~VpFYL^X`0CCgKtQFi!w(GE)7X?
zis$a51y-ED+mEBA*s*CcTTv&o!mEW%g*OVlh3EgihgZ$aAMK-2sopL{(P3BYl_>KU
zG$YcG?$*(RlPwW?J(D4)q2-`HIKk>=#eD%<Z8v|Xf)XjVhi|N)c(V2IUBagI@J8r~
zM|%`yyod<q%{(bmvJsFTqMcOzE#m}_!2DO>??eBIKY7&vE2OCyFTcxYRARoxeleeg
zZ>S_QW&3%a5P!PIt14-n#s8>(p(1fR0^jcy3mb0K6JuGuJiH42&OUAvc5WY^FYM|*
zo?V5-@9X1R1l#ZPV}k4M^J`T!yoO?<xKu~)xq1wuCgPHq1$T?7pX0!<g^XLlABFI<
z;F=H~2mURDUjUyq_U99yg()HYB4f#HV~8*v4qYKU6FfhJXMy+dfk$cK()H-lfoict
zT-{2JYJ<0KB@f-lbLY1Qly2o~(FraE{$;?cI5dGv&#KW8hbYL0c*jvna5aPV)_^QA
z6T1T5EXfQ@XM<3(KVY-MWaiiSHY^X9)k7x6d%<xS7nckc2W8>_S)ERdi~k<I%ogKW
z3O0e~;t|xsf?X^Y9dX``2pq`FY$!NCLS`R=MZk6NQ6va1Xf#-c|4_|;EI0xzPP>S=
zft$2_4k8^(2RD$62NB3O8{8fl^mj?@EeOmS6pU;k_!m?l7_c0C13RkF608&aB!R>}
z1N-5>Qyb3(-@%09)esxV2iHGY5V2igIao0l9LgcAL`iL0z|Y`fBoObSNYDWGhD_K3
z)?q?%0>t<^@O7Qc+BCihzJh#<G`;~ouPs1q^A^~wRm>?$)&b#Kh{L~N@ifJUjF{jN
z>`bgUSP}7Fehz<py`xDif>+nmCp@Kr_H%y&t>mj3$-(zGQUbrwNPgaWoMNRY-gcZ4
z%m}NG$C2Ynbu^d{ZK6maHT6qrnsfrvM4r(^3E{o)=mq+TZ)~FMNL%m}V}3oCnhA@;
z<HuJV8_8!kQ=DNc-o#;iO*4%$WZ<{SmtwXdT;4=-jchjMwNhTIF0WOe*J}8o)mZl*
DlNrE`

diff --git a/system.c b/system.c
new file mode 100644
index 0000000..9ac43db
--- /dev/null
+++ b/system.c
@@ -0,0 +1,8 @@
+#include "system.h"
+
+void *memset(void *dest, char val, size_t count)
+{
+	char *temp = (char *)dest;
+	for(; count != 0; count--) *temp++ = val;
+	return dest;
+}
diff --git a/system.h b/system.h
new file mode 100644
index 0000000..5a9118e
--- /dev/null
+++ b/system.h
@@ -0,0 +1,8 @@
+#ifndef SYSTEM_H
+#define SYSTEM_H
+
+typedef int size_t;
+
+void *memset(void *dest, char val, size_t count);
+
+#endif